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Under
development
Preliminary Specifications REV.B3
Specifications in this manual are tentative and subject to change.
Mitsubishi Microcomputers
M32C/83 group
SINGLE-CHIP 16/32-BIT CMOS MICROCOMPUTER
Description
14
Table 1.1.9. Pin description (1/4)
Function
I/O port
Description
An 8-bit CMOS I/O port.
It has an input/output port direction register that allows the
user to set each pin for input or output individually.
The user can specify in units of four bits via software whether
or not they are tied to a pull-up resistor.
When set as a separate bus, these pins input and output 8
low-order data bits.
This is an 8-bit I/O port equivalent to P0.
When set as a separate bus, these pins input and output 8
high-order data bits.
This is an 8-bit I/O port equivalent to P0.
These pins output 8 low-order address bits.
If a multiplexed bus is set, these pins input and output data and
output 8 low-order address bits separated in time by
multiplexing.
This is an 8-bit I/O port equivalent to P0.
These pins output 8 middle-order address bits.
If the external bus is set as a 16-bit wide multiplexed bus,
these pins output 8 middle-order address bits, and input and
output 8 middle-order data separated in time by multiplexing.
I/O
I/O type
I/O
O
I/O
O
I/O
P00 to P07
D0 to D7
P10 to P17
D8 to D15
P20 to P27
A0 to A7
A0/D0 to
A7/D7
P30 to P37
A8 to A15
A8/D8 to
A15/D15
Pin name
MA0 to MA7
If accessing to DRAM area, these pins output row address
and column address separated in time by multiplexing.
O
P0
P1
P2
P3
Port
Data bus
Address bus
Address bus/data bus
Address bus
Address bus/data bus
P15 to P17 function as external interrupt pins.
External interrupt input
port
I
INT3 to INT5
Address bus
I/O port
This is an 8-bit I/O port equivalent to P0.
I/O
O
P40 to P47
A16 to A22
A23
Chip select
MA8 to MA12
O
P4
Address bus
CS0 to CS3
P40 to P47 are chip select output pins to specify access area.
These pins output 8 high-order address bits.
Highest address bit (A23) outputs inversely.
If accessing to DRAM area, these pins output row address and
column address separated in time by multiplexing.
P00 to P07 are analog input ports for the A-D converter.
I
AN00 to AN07
Analog input port
P20 to P27 are analog input ports for the A-D converter.
I
AN20 to AN27
Analog input port
VCC
VSS
CNVSS
XIN
XOUT
BYTE
AVCC
AVSS
VREF
4.2 to 5.5 V or 3.0V to 3.6V.
0 V.
Connect it to VSS : Single-chip or memory expansion mode
Connect it to VCC : Microprocessor mode
A “L” on this input resets the microcomputer.
These pins are provided for the main clock generating circuit.
Connect a ceramic resonator or crystal between the XIN and
the XOUT pins. To use an externally derived clock, input it to
the XIN pin and leave the XOUT pin open.
Selects the width of the data bus for external memory.
Connect it to VSS : A 16-bit width
Connect it to VCC : An 8-bit width
Connect this pin to VCC.
Connect this pin to VSS.
This pin is a reference voltage input for the A-D converter.
I
O
I
Power supply
input
CPU mode switch
Reset input
Clock input
Clock output
External data
bus width
select input
Analog power
supply input
Reference
voltage input
RESET
I