Rev. 4149M–AERO–06/03
1
Features
• 8032 Pin and Instruction Compatible
• Four 8-bit I/O Ports
• Three 16-bit Timer/Counters
• 256 bytes RAM
• Full-duplex UART
• Asynchronous Port Reset
• 6 Sources, 2 Level Interrupt Structure
• 64 Kbytes Program Memory Space
• 64 Kbytes Data Memory Space
• Power Control Modes
• Idle Mode
• Power-down Mode
• On-chip Oscillator
• Operating Frequency: 30 MHz
• Power Supply: 4.5V to 5.5V
• Temperature Range: Military (-55
o
C to 125
o
C)
• Packages: Side Brazed 40-pin, MQFPJ 44-pin
• QML Q and V with SMD 5962-00518
• SCC C an B with Specification SCC9521002
Description
The 80C32E is a radiation tolerant ROMless version of the 80C52 single chip 8-bit
microcontroller.
The 80C32E retains all the features of the 80C32 with 256 bytes of internal RAM, a 6-
source, 2-level interrupt system, an on-chip oscillator and three 16-bit timer/counters.
The fully static design of the 80C32E reduces system power consumption by bringing
the clock frequency down to any value, even DC, without loss of data.
The 80C32E has 2 software-selectable modes of reduced activity for further reduction
in power consumption. In the idle mode the CPU is frozen while the timers, the serial
port and the interrupt system are still operating. In the power-down mode the RAM is
saved and all other functions are inoperative.
Rad. Tolerant
8-bit ROMless
Microcontroller
80C32E
3
80C32E
4149M–AERO–06/03
Pin Description
Mnemonic Type Name and Function
V
SS
I Ground: 0V reference
V
CC
I
Power Supply: This is the power supply voltage for normal, idle and
power-down operation
P0.0-P0.7 I/O
Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that
have 1s written to them float and can be used as high impedance inputs.
Port 0 pins must be polarized to Vcc or Vss in order to prevent any
parasitic current consumption. Port 0 is also the multiplexed low-order
address and data bus during access to external program and data
memory. In this application, it uses strong internal pull-up when emitting
1s.
P1.0-P1.7 I/O
Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. Port 1
pins that have 1s written to them are pulled high by the internal pull-ups
and can be used as inputs. As inputs, Port 1 pins that are externally
pulled low will source current because of the internal pull-ups.
P2.0-P2.7 I/O
Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2
pins that have 1s written to them are pulled high by the internal pull-ups
and can be used as inputs. As inputs, Port 2 pins that are externally
pulled low will source current because of the internal pull-ups. 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
pull-ups emitting 1s. During accesses to external data memory that use
8-bit addresses (MOVX @Ri), port 2 emits the contents of the P2 SFR.
P3.0-P3.7
I/O Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3
pins that have 1s written to them are pulled high by the internal pull-ups
and can be used as inputs. As inputs, Port 3 pins that are externally
pulled low will source current because of the internal pull-ups. Port 3 also
serves the special features of the 80C51 family, as listed below.
I RXD (P3.0): Serial input port
O TXD (P3.1): Serial output port
I INT0
(P3.2): External interrupt 0
I INT1
(P3.3): External interrupt 1
I T0 (P3.4): Timer 0 external input
I T1 (P3.5): Timer 1 external input
O WR
(P3.6): External data memory write strobe
O RD
(P3.7): External data memory read strobe
RST I
Reset: A high on this pin for two machine cycles while the oscillator is
running, resets the device. An internal diffused resistor to V
SS
permits a
power-on reset using only an external capacitor to V
CC.
