80C32/80C52/80C32E
CMOS 0 to 36 MHz Single Chip 8–bit Microcontroller
1. Description
TEMIC’s 80C52 and 80C32 are high performance CMOS versions of the 8052/8032 NMOS single chip 8 bit
Microcontroller.
The fully static design of the TEMIC 80C52/80C32 allows to reduce system power consumption by bringing the clock
frequency down to any value, even DC, without loss of data.
The 80C52 retains all the features of the 8052: 8 K bytes of ROM; 256 bytes of RAM; 32 I/O lines; three 16 bit timers;
a 6-source, 2-level interrupt structure; a full duplex serial port; and on-chip oscillator and clock circuits. In addition,
the 80C52 has 2 software-selectable modes of reduced activity for further reduction in power consumption. In the idle
mode the CPU is frozen while the RAM, the timers, the serial port and the interrupt system continue to function. In
the power down mode the RAM is saved and all other functions are inoperative.
The 80C32 is identical to the 80C52 except that it has no on-chip ROM. TEMIC’s 80C52/80C32 are manufactured
using SCMOS process which allows them to run from 0 up to 36 MHz with VCC = 5 V.
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D
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80C32: Romless version of the 80C52
80C32/80C52-12: 0 to 12 MHz
80C32/80C52-30: 0 to 30 MHz
80C32/80C52-36: 0 to 36 MHz
80C32E-30: 0 to 30 MHz Radiation Tolerant
2. Features
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Power control modes
256 bytes of RAM
8 Kbytes of ROM (80C52)
32 programmable I/O lines
Three 16 bit timer/counters
64 K program memory space
64 K data memory space
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July 03, 2000
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80C32/80C52/80C32E
3. Interface
VCC VSS
INT0
INT1
RST
XTAL1
XTAL2
EA
ALE
PSEN
WR
RD
AD0–AD7
A8–A15
Parallel I/O Ports
&
External Bus
8–BIT INTERNAL BUS
Oscillator
&
Timing
CPU
RAM
256 bytes
ROM
8 Kbytes
Interrupt Unit
Serial I/O Port
Timer 0
Timer 1
Timer 2
P0
P1
P2
P3
RxD
TxD
T0
T1
T2
T2EX
Figure 1. Block Diagram
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July 03, 2000
80C32/80C52/80C32E
P1.1/T2EX
P0.0/A0
P0.1/A1
P0.2/A2
6
P1.5
P1.6
5
4
3
2
1 44 43 42 41 40
39
38
37
36
35
P0.4/A4
P0.5/A5
P0.6/A6
P0.7/A7
EA
NC
ALE
PSEN
P2.7/A15
P2.6/A14
P2.5/A13
7
8
9
10
11
12
13
14
15
16
17
18 19 20 21 22 23 24 25 26 27 28
P2.2/A10
P2.3/A11
P2.1/A9
P2.4/A12
XTAL2
XTAL1
VSS
NC
WR/P3.6
RD/P3.7
P2.0/A8
80C32/80C52/
80C32E
P1.7
RST
RxD/P3.0
NC
TxD/P3.1
INT0/P3.2
INT1/P3.3
T0/P3.4
T1/P3.5
80C32/80C52/
80C32E
P0.3/A3
P1.0/T2
VCC
P1.4
P1.3
P1.2
NC
34
33
32
31
30
29
CDIL
JLCC
Diagrams are for reference only. Package sizes are not to scale.
Figure 2. Pin Configuration
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July 03, 2000
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80C32/80C52/80C32E
4. Pin Description
4.1. VSS
Circuit ground potential.
4.2. VCC
Supply voltage during normal, Idle, and Power Down operation.
4.3. Port 0
Port 0 is an 8 bit open drain bi-directional I/O port. Port 0 pins that have 1’s written to them float, and in that state can
be used as high-impedance inputs.
Port 0 is also the multiplexed low-order address and data bus during accesses to external Program and Data Memory.
In this application it uses strong internal pullups when emitting 1’s. Port 0 also outputs the code bytes during program
verification in the 80C52. External pullups are required during program verification. Port 0 can sink eight LS TTL
inputs.
4.4. Port 1
Port 1 is an 8 bit bi-directional I/O port with internal pullups. Port 1 pins that have 1’s written to them are pulled high
by the internal pullups, and in that state can be used as inputs. As inputs, Port 1 pins that are externally being pulled
low will source current (IIL, on the data sheet) because of the internal pullups.
Port 1 also receives the low-order address byte during program verification. In the 80C52, Port 1 can sink/ source three
LS TTL inputs. It can drive CMOS inputs without external pullups.
2 inputs of PORT 1 are also used for timer/counter 2 :
P1.0 [T2]: External clock input for timer/counter 2. P1.1 [T2EX]: A trigger input for timer/counter 2, to be reloaded
or captured causing the timer/counter 2 interrupt.
4.5. Port 2
Port 2 is an 8 bit bi-directional I/O port with internal pullups. Port 2 pins that have 1’s written to them are pulled high
by the internal pullups, and in that state can be used as inputs. As inputs, Port 2 pins that are externally being pulled
low will source current (ILL, on the data sheet) because of the internal pullups. Port 2 emits the high-order address
byte during fetches from external Program Memory and during accesses to external Data Memory that use 16 bit
addresses (MOVX @DPTR). In this application, it uses strong internal pullups when emitting 1’s. During accesses to
external Data Memory that use 8 bit addresses (MOVX @Ri), Port 2 emits the contents of the P2 Special Function
Register.
It also receives the high-order address bits and control signals during program verification in the 80C52. Port 2 can
sink/source three LS TTL inputs. It can drive CMOS inputs without external pullups.
4.6. Port 3
Port 3 is an 8 bit bi-directional I/O port with internal pullups. Port 3 pins that have 1’s written to them are pulled high
by the internal pullups, and in that state can be used as inputs. As inputs, Port 3 pins that are externally being pulled
low will source current (ILL, on the data sheet) because of the pullups. It also serves the functions of various special
features of the TEMIC 51 Family, as listed below.
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80C32/80C52/80C32E
Port Pin
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
Alternate Function
RXD (serial input port)
TXD (serial output port)
INT0 (external interrupt 0)
INT1 (external interrupt 1)
TD (Timer 0 external input)
T1 (Timer 1 external input)
WR (external Data Memory write strobe)
RD (external Data Memory read strobe)
Port 3 can sink/source three LS TTL inputs. It can drive CMOS inputs without external pullups.
4.7. RST
A high level on this for two machine cycles while the oscillator is running resets the device. An internal pull-down
resistor permits Power-On reset using only a capacitor connected to VCC. As soon as the Reset is applied (Vin), PORT
1, 2 and 3 are tied to one. This operation is achieved asynchronously even if the oscillator does not start-up.
4.8. ALE
Address Latch Enable output for latching the low byte of the address during accesses to external memory. ALE is
activated as though for this purpose at a constant rate of 1/6 the oscillator frequency except during an external data
memory access at which time one ALE pulse is skipped. ALE can sink/source 8 LS TTL inputs. It can drive CMOS
inputs without an external pullup.
4.9. PSEN
Program Store Enable output is the read strobe to external Program Memory. PSEN is activated twice each machine
cycle during fetches from external Program Memory. (However, when executing out of external Program Memory, two
activations of PSEN are skipped during each access to external Data Memory). PSEN is not activated during fetches
from internal Program Memory. PSEN can sink/source 8 LS TTL inputs. It can drive CMOS inputs without an external
pullup.
4.10. EA
When EA is held high, the CPU executes out of internal Program Memory (unless the Program Counter exceeds 1
FFFH). When EA is held low, the CPU executes only out of external Program Memory. EA must not be floated.
4.11. XTAL1
Input to the inverting amplifier that forms the oscillator. Receives the external oscillator signal when an external
oscillator is used.
Output of the inverting amplifier that forms the oscillator. This pin should be floated when an external oscillator is used.
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