56853 General Description
• 120 MIPS at 120MHz
• 12K x 16-bit Program SRAM
• 4K x 16-bit Data SRAM
• 1K x 16-bit Boot ROM
• Access up to 2M words of program memory or 8M of
data memory
• Chip Select Logic for glue-less interface to ROM and
SRAM
• Six (6) independent channels of DMA
• Enhanced Synchronous Serial Interfaces (ESSI)
• Two (2) Serial Communication Interfaces (SCI)
• Serial Port Interface (SPI)
• 8-bit Parallel Host Interface
• General Purpose 16-bit Quad Timer
• JTAG/Enhanced On-Chip Emulation (OnCE™) for
unobtrusive, real-time debugging
• Computer Operating Properly (COP)/Watchdog Timer
• Time-of-Day (TOD)
• 128 LQFP package
• Up to 41 GPIO
V
DDIO
6
11
V
DD
6
V
SSIO
10
V
SS
V
DDA
6
V
SSA
JTAG/
Enhanced
OnCE
Program Controller
and
Hardware Looping Unit
Address
Generation Unit
16-Bit
56800E Core
Data ALU
16 x 16 + 36
→
36-Bit MAC
Three 16-bit Input Registers
Four 36-bit Accumulators
Bit
Manipulation
Unit
PAB
PDB
CDBR
CDBW
Memory
Program Memory
12,288 x 16 SRAM
Boot ROM
1024 x 16 ROM
Data Memory
4,096 x 16 SRAM
XDB2
XAB1
XAB2
PAB
PDB
CDBR
CDBW
IPBus Bridge (IPBB)
IPWDB
Decoding
Peripherals
A0-20 [20:0]
D0-D15 [15:0]
RD Enable
WR Enable
CS0-CS3[3:0] or
GPIOA0-A3[3:0]
Bus Control
External Address
Bus Switch
External Data
Bus Switch
External Bus
Interface Unit
ESSI0
or
GPIOC
IPRDB
IPAB
DMA Requests
Core CLK
POR
3
System Bus
Control
DMA
6 channel
IPBus CLK
CLKO
MODEA-C or
(GPIOH0-H2)
System
COP/TOD CLK Integration
Module
RSTO
RESET
EXTAL
XTAL
2 SCI
or
GPIOE
Quad
Timer
or
GPIOG
4
SPI
Host
Interrupt
or
Interface Controller
GPIOF
or
GPIOB
4
16
IRQA
IRQB
COP/
Watch-
dog
Time
of
Day
Clock
Generator
OSC PLL
4
6
56853 Block Diagram
56853 Technical Data, Rev. 6
Freescale Semiconductor
3
Part 1 Overview
1.1 56853 Features
1.1.1
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Core
Efficient 16-bit engine with dual Harvard architecture
120 Million Instructions Per Second (MIPS) at 120MHz core frequency
Single-cycle 16
×
16-bit parallel Multiplier-Accumulator (MAC)
Four (4) 36-bit accumulators including extension bits
16-bit bidirectional shifter
Parallel instruction set with unique DSP addressing modes
Hardware DO and REP loops
Three (3) internal address buses and one (1) external address bus
Four (4) internal data buses and one (1) external data bus
Instruction set supports both DSP and controller functions
Four (4) hardware interrupt levels
Five (5) software interrupt levels
Controller-style addressing modes and instructions for compact code
Efficient C Compiler and local variable support
Software subroutine and interrupt stack with depth limited only by memory
JTAG/Enhanced OnCE debug programming interface
1.1.2
•
•
Memory
Harvard architecture permits up to three (3) simultaneous accesses to program and data memory
On-Chip Memory
— 12K
×
16-bit Program SRAM
— 4K
×
16-bit Data SRAM
— 1K
×
16-bit Boot ROM
•
Off-Chip Memory Expansion (EMI)
— Access up to 2M words of program memory or 8M data memory
— Chip Select Logic for glue-less interface to ROM and SRAM
1.1.3
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Peripheral Circuits for 56853
General Purpose 16-bit Quad Timer*
Two (2) Serial Communication Interfaces (SCI)*
Serial Peripheral Interface (SPI) Port*
Enhanced Synchronous Serial Interface (ESSI) modules*
Computer Operating Properly (COP)
56853 Technical Data, Rev. 6
4
Freescale Semiconductor
56853 Description
•
•
•
•
•
•
•
Watchdog Timer
JTAG/Enhanced On-Chip Emulation (OnCE) for unobtrusive, real-time debugging
Six (6) independent channels of DMA
8-bit Parallel Host Interface*
Time-of-Day (TOD)
128 LQFP package
Up to 41 GPIO
* Each peripheral I/O can be used alternately as a General Purpose I/O if not needed
1.1.4
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•
Energy Information
Fabricated in high-density CMOS with 3.3V, TTL-compatible digital inputs
Wait and Stop modes available
1.2 56853 Description
The 56853 is a member of the 56800E core-based family of controllers. It combines, on a single chip, the
processing power of a Digital Signal Processor (DSP) and the functionality of a microcontroller with a
flexible set of peripherals to create an extremely cost-effective solution. Because of its low cost,
configuration flexibility, and compact program code, the 56853 is well-suited for many applications. The
56853 includes many peripherals that are especially useful for low-end Internet appliance applications
and low-end client applications such as telephony; portable devices; Internet audio and point-of-sale
systems, such as noise suppression; ID tag readers; sonic/subsonic detectors; security access devices;
remote metering; sonic alarms.
The 56800E core is based on a Harvard-style architecture consisting of three execution units operating in
parallel, allowing as many as six operations per instruction cycle. The microprocessor-style programming
model and optimized instruction set allow straightforward generation of efficient, compact DSP and
control code. The instruction set is also highly efficient for C Compilers, enabling rapid development of
optimized control applications.
The 56853 supports program execution from either internal or external memories. Two data operands can
be accessed from the on-chip Data RAM per instruction cycle. The 56853 also provides two external
dedicated interrupt lines, and up to 41 General Purpose Input/Output (GPIO) lines, depending on
peripheral configuration.
The 56853 controller includes 12K words of Program RAM, 4K words of Data RAM, and 1K words of
Boot ROM. It also supports program execution from external memory. The 56800 core can access two data
operands from the on-chip Data RAM per instruction cycle.
This controller also provides a full set of standard programmable peripherals that include an 8-bit parallel
Host Interface, Enhanced Synchronous Serial Interface (ESSI), one Serial Peripheral Interface (SPI), the
option to select a second SPI or two Serial Communications Interfaces (SCIs), and Quad Timer. The Host
Interface, ESSI, SPI, SCI, four chip selects and quad timer can be used as General Purpose Input/Outputs
(GPIOs) if its primary function is not required.
56853 Technical Data, Rev. 6
Freescale Semiconductor
5
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