MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION (MICROCOMPUTER MODE)
Input/
Output
Pin
Name
Functions
VCC, VSS
CNVSS
Power supply
Supply 5 V±10 % to VCC and 0 V to VSS.
CNVSS input
Reset input
Clock input
Input
Input
This pin controls the processor mode. Connect to VSS for single-chip mode or memory
expansion mode. Connect to VCC for microprocessor mode and external ROM version.
RESET
XIN
This is reset input pin. The microcomputer is reset when supplying “L” level to this
pin.
These are I/O pins of internal clock generating circuit.Connect a ceramic or quartz-
crystal resonator between XIN and XOUT. When an external clock is used, the clock
Input
XOUT
E
Clock output
Output
source should be connected to the XIN pin and the XOUT pin should be left open.
_
Output This pin outputs enable signal E, which indicates access state of data bus for
Enable output
single-chip mode.
___
This pin outputs RD signal for memory expansion mode or microprocessor mode.
BYTE
(Note)
Bus width select input
Analog supply input
Input
This pin determines whether the external data bus is 8-bit width or 16-bit width for
memory expansion mode or microprocessor mode. The width is 16 bits when “L”
signal inputs and 8 bits when “H” signal inputs.
AVCC,
AVSS
Power supply for the A-D converter and the D-A converter. Connect AVCC to VCC
and AVSS to VSS externally.
VREF
Reference voltage input
I/O port P0
Input
I/O
This is reference voltage input pin for the A-D converter and the D-A converter.
P00 – P07
In single-chip mode, port P0 is an 8-bit I/O port. This port has an I/O direction
register and each pin can be programmed for input or output. These ports are in
the input mode when reset. Address (A0 - A7) is output in memory expansion mode
or microprocessor mode.
P10 – P17
I/O port P1
I/O
I/O
I/O
In single-chip mode, these pins have the same functions as port P0. Address (A8 -
A15) is output in memory expansion mode or microprocessor mode.
P20 – P23, I/O port P2
P27
In single-chip mode, these pins have the same functions as port P0. Address (A16 -
A19, A23) is output in memory expansion mode or microprocessor mode.
P30 – P33
I/O port P3
In single-chip mode, these pins have the same functions as port P0. In memory
___ ____
_____
expansion mode or microprocessor mode, WR, BHE , ALE, and HLDA signals are
output.
P40 – P47
I/O port P4
I/O
In single-chip mode, these pins have the same functions as port P0. In memory
_____
expansion mode or micro processor mode, P40, P41, and P42 become HOLD and
____
RDY input pins, and clock φ1 output pin respectively. Functions of other pins are
the same as in single-chip mode. In memory expansion mode, P42 can be
programmed as I/O port.
P50 – P57
P60 – P67
I/O port P5
I/O port P6
I/O
I/O
In addition to having the same functions as port P0 in single-chip mode, these pins
also function as I/O pins for timer A0, timer A1, timer A2, timer A3, output pins for
motor drive waveform, and input pins for key input interrupt.
In addition to having the same functions as port P0 in single-chip mode, these pins
____
also function as I/O pins for timer A4, input pins for external interrupt input INT0,
____
____
INT1, and INT2, and input pins for timer B0, timer B1, and timer B2.
P70 – P77
P80 – P87
I/O port P7
I/O port P8
I/O
I/O
In addition to having the same functions as port P0 in single-chip mode, these pins
also function as input pins for A-D converter.
In addition to having the same functions as port P0 in single-chip mode, these pins
also function as I/O pins for UART0, UART1, output pins for D-A converter, and
____
input pin for INT4.
P90 – P95
I/O port P9
I/O
In addition to having the same functions as port P0 in single-chip mode, these pins
____
also function as input pin for INT3, output pins for motor drive waveform.
In memory expansion mode and microprocessor mode, these pins can be
___ ___
programmed as address (A20 - A22) or output pins for CS0 – CS4
Note: It is impossible to change the input level of the BYTE pin in each bus cycle. In other words, bus width cannot be switched dynamically. Fix the input
level of the BYTE pin to “H” or “L” according to the bus width used.
5
RENESAS [ RENESAS TECHNOLOGY CORP ]
