SC-604
Speech And Music Processor
Data sheet
Features
Advanced, Integrated Speech Synthesizer for
High-Quality Sound
Operates up to 12.32 MHz (Performs up to 12
MIPS)
Slave Mode Enables Hours of Speech Using an
External Processor and Memory
Master Mode Allows 6.8 Minutes of Speech
Onboard
Supports High-Quality Synthesis Algorithms
such as MX, CX, Simple CX, LX, ADPCM, and
Polyphonic Music
Simultaneous Speech Plus Music Capabilities
Very Low-Power Operation, Ideal for Hand-Held
Devices
Low-Voltage Operation, Sustainable by Three
(3) Batteries
Reduced Power Standby Modes, Less Than 10
µA
in Deep-Sleep Mode
16 General-Purpose I/O Pins (in Master Mode)
or 4 General-Purpose I/O Pins (in Slave Mode)
Resistor-Trimmed Oscillator or 32.768-kHz
Crystal Reference Oscillator
Slave Interface Logic Contains 64K Bytes-
Words Onboard ROM (2K Words Reserved)
640-Word RAM
Direct Speaker Drive, 32
Ω
(PDM)
One-Bit Comparator With Edge Detection
Interrupt Service
Serial Scan Port for In-Circuit Emulation,
Monitor, and Test
Available in Die Form or 64-Pin LQFP Package
Description
The SC-604 is a low-cost, mixed-signal
processor that combines a speech synthesizer
with a dedicated slave interface logic, general-
purpose I/O, onboard ROM, and direct speaker-
drive in a single package. The computational
unit uses a powerful new DSP that gives the SC-
604 unprecedented speed and computational
flexibility compared with previous devices of its
type. The SC-604 supports a variety of speech
and audio coding algorithms, providing a range
of options with respect to speech duration and
sound quality.
SC-691 Block Diagram
16-Bit
Microprocessor
10-Bit
DAC
640-words
RAM
TIMER 1
TIMER 2
PLLM
SLAVE LOGIC
64K-Bytes ROM
COMPARATOR
The device consists of a micro-DSP core,
embedded program and data memory, and a self-contained clock generation system. General-purpose
periphery is comprised of 16 bits of partially configurable I/O.
The core processor is a general-purpose 16-bit microcontroller with DSP capability. The basic core block
includes a computational unit (CU), data address unit, program address unit, two timers, eight-level interrupt
processor, and several system and control registers. The core processor gives the SC-604break-point capability
in emulation.
The processor is a Harvard type for efficient DSP algorithm execution, separating program and data memory
blocks to permit simultaneous access. The ROM has a protection scheme to prevent third-party pirating. It is
configured in 32K 17-bit words.
The total ROM space is divided into two areas:
1) The lower 2K words are reserved by Sensory, Inc. for a built-in self-test
2) The upper 30K is for user program and data space.
© 2002 Sensory Inc.
P/N 80-0208-B
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SC-604
Data sheet
The data memory is internal static RAM. The RAM is configured in 640 17-bit words. All memories are designed
to consume minimum power at a given system clock and algorithm acquisition frequency.
A flexible clock generation system enables the software to control the clock over a wide frequency range. The
implementation uses a phase-locked loop (PLL) circuit that drives the processor clock at a selectable frequency
between the minimum and maximum achievable. Selectable frequencies for the processor clock are spaced
apart in 65.536-kHz steps. The PLL clock-reference is also selectable; either a resistor-trimmed oscillator or a
crystal-referenced oscillator may be used. Internal and external clock sources are controlled separately to
provide different levels of power management.
The periphery consists of two 8-bit-wide general-purpose I/O ports when operating in master mode, or four
general-purpose I/O pins in slave mode. In the master mode, the bidirectional I/O can be configured under
software control as either high-impedance inputs or as totem-pole output. They are controlled via addressable
I/O registers. These features make the input port especially useful as a key-scan interface. Slave mode consists
of four general-purpose I/O, four control pins, and eight bidirectional data pins.
A simple one-bit comparator is also included in the periphery. The comparator is enabled by a control register,
and its access is shared with two pins in one general-purpose I/O port. Rounding out the SC-604 periphery is a
built-in pulse-density-modulated DAC (digital-to-analog converter) with direct speaker-drive capability. The
following block diagram gives an overview of the SC-604functionality.
Functional block diagram
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P/N 80-0208-B
© 2002 Sensory Inc.
Data Sheet
SC-604
Functional Description
The SC-604 is a member of the SC-6x family, which is based on the SC-614 core. For specific details about the
core operations, instruction sets, register definitions, port configuration, etc., consult the SC-614 User’s Guide
(80-0212).
The SC-604 can be used as a slave synthesizer in slave mode or can operate stand-alone in master mode. The
slave mode activates logic circuitry internal to the device that gives the device a dedicated slave interface. The
slave or master mode is controlled by the bit 0 of the Port G (PG0). By default the device initially starts in slave
mode. To change to master mode write a 0x01 to G port 0 (0x2C). To change back to slave mode write a 0x00
to port G bit 0 (0x2C).
Master Mode
In master mode, the slave logic circuitry is disabled and SC-604has 16 general-purpose I/Os. These 16
input/output pins are organized as 2-byte-wide ports (C and D), initialized as inputs. Each of the pins can be
configured as a totem-pole output or as a high-impedance input by setting or clearing the appropriate bit in the
appropriate control register (0x14, 0x1C). When configured as an output, the data driven by the output pin can
be controlled by setting or clearing the appropriate bit in the appropriate data register (0x10, 0x18). Whether
configured as input or as output, reading the data port reads the actual state of the pin.
External interrupts can be caused by transitions on pins PD2, PD3, PD4, and PD5 in the master mode. These
interrupts are supported whether the pins are programmed as inputs or outputs.
Slave Mode
In slave mode, the slave logic circuitry is enabled allowing the device to have a dedicated slave interface. In this
mode, only four pins of port D (PD4–PD7) are available as general-purpose I/O while the remaining pins (PD0–
PD3) are redefined as INRDY, OUTRDY, STROBE and R/W. These pins are used to operate the slave
interface. The SC-604controls the INRDY and OUTRDY pins to let the external microcontroller know when the
slave is ready to accept or transmit data. The external microcontroller controls the R/W and STROBE pins of
SC-604to sequence the read/write data flow. Each read or write sequence generates an interrupt that needs to
be serviced by an interrupt service routine. These interrupt service routines need to be written by the code
developer. The INT3 interrupt service routine indicates that the host has completed the write sequence, and the
slave should read the data from port A. The INT4 interrupt service routine indicates the host has completed the
read sequence. An interrupt is not generated when a read/write is done on port G bit 0 (PG0).
The slave interface consists of:
8-bit bidirectional data bus (PC0–PC7)
2 status outputs: INRDY/PD0, and OUTRDY/PD1
2 control inputs: STROBE/PD2, and R/W/PD3
4 general-purpose I/Os (PD4–PD7)
Port C is used as an 8-bit bidirectional data bus. When data is to be sent to the host, it needs to be written to
port C data register (0x10). When data is read from the host, it needs to be read from port A data register
(0x00). Port A pins are not physically brought outside the device but are internally connected with the pins of
port C.
System Initialization Sequence In The Slave Mode
Initialize the host processor first.
The host must hold the slave RESET pin low until the slave STROBE pin can be held high by the host
throughout the slave initialization process.
The INRDY and OUTRDY pins are set high by the slave on the rising edge of the slave RESET pin.
Slave Mode Software Initialization
Write 0x00 to port A (0x00), port C (0x10), port D (0x18) data registers.
Configure the port C (PC0–PC7), port D0, and port D1 as output ports. (Write 0xFF to port C (0x14) and
0x03 to port D (0x1C) control registers)
© 2002 Sensory Inc.
P/N 80-0208-B
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SC-604
Data sheet
Configure port A (PA0–PA7), PORT D2, and port D3 as input ports (default at reset). Write 0x00 to port A
(0x04) and 0x03 to port D (0x1C) control registers.
After the slave completes its initialization, the slave needs to inform the host that it is ready to read or write
data.
Note:
the default mode for the MSP50C604 is the slave mode. The MSP50C604 can be set to master mode by
writing a 1 to port G bit 0. This is an internal bit that is not available on the MSP50C604 external pins.
Note:
the initialization sequence given previously is a specific requirement for setting up the MSP50C604 in
slave mode. For the basic initialization requirements of the device, please refer to the MSP50C614 user’s guide
(SPSU014).
Write To Slave In The Slave Mode
The slave indicates it is ready to receive data from the host by dropping INRDY low. This is done by writing
low-high-low to port D (0x18) bit 0 (PD0).
On the falling edge of the internal PD0 pulse, INRDY toggles low, notifying the host that the slave is ready to
receive data.
The host writes data to the slave by setting R/W low and then pulsing the STROBE high-low-high.
The slave latches the data on the rising edge of the STROBE pulse and sets INRDY high.
An INT3 interrupt is generated as INRDY goes high completing the write cycle.
The latched data is read by the slave through port A (0x00) data register.
Read From Slave In The Slave Mode
When the slave has data for the host, it places the data in port C (0x10).
The slave then indicates that the data is ready by dropping OUTRDY low. This is done by writing low-high-
low to port D (0x18) bit 1 (PD1).
On the falling edge of the internal PD1 pulse, OUTRDY toggles low notifying the host that the slave is ready
to send data.
The host responds by setting R/W high and then pulsing STROBE high-low-high.
The host should latch the data before raising STROBE high.
This informs the slave that the data has been written to the host. The OUTRDY is pulled high by the slave at
the rising edge of STROBE.
An INT4 interrupt is generated as OUTRDY goes high completing the read cycle.
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P/N 80-0208-B
© 2002 Sensory Inc.
Data Sheet
SC-604
Timing Diagram
Write to Slave
1. Slave signals readiness to receive data from host.
2. Slave drops INRDY.
3. Host drops R/W to indicate a write.
4. Host drops STROBE.
5. Host places data on the bus.
6. Host raises STROBE indicating data is valid.
7. Slave raises INRDY, latching the data.
8. INT3 is triggered when INRDY rises.
Write to Slave
INRDY low to STROBE low
t
IS (min)
= 5 ns
R/W to STROBE low
t
RS (min)
= 75 ns
STROBE low
t
ST (min)
= 100 ns
STROBE high to R/W
t
SR (min)
= 25 ns
STROBE high to INRDY high t
SI (max)
= 75 ns
Data setup
t
S (min)
= 15 ns
Data hold
t
H (min)
= 80 ns
Read from Slave
1. Slave signals readiness to send data to host.
2. Slave drops OUTRDY.
3. Host raises R/W to indicate a read.
4. Host drops STROBE.
5. Slave places data on the bus.
6. Host raises STROBE after reading the data.
7. Slave raises OUTRDY.
8. INT4 is triggered when OUTRDY rises.
Read from Slave
OUTRDY low to STROBE low
t
OS (min)
= 5 ns
R/W to STROBE low
t
RS (min)
= 75 ns
STROBE low
t
ST (min)
= 100 ns
STROBE high to R/W
t
SR (min)
= 25 ns
STROBE high to OUTRDY high t
SO (max)
= 75 ns
STROBE Low to data valid
t
DV (max)
= 90 ns
STROBE High to data high Z
t
DZ (min)
= 90 ns
Timing Constrains
© 2002 Sensory Inc.
P/N 80-0208-B
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