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M37920S4CGP

16-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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MITSUBISHI MICROCOMPUTERS

M37920S4CGP

16-BIT CMOS MICROCOMPUTER

PIN DESCRIPTION (Microcomputer mode)

Input/

Pin

Name

Output

Functions

Vcc, Vss Power supply input

— Apply 5 V±10 % to Vcc, and 0 V to Vss.

MD0

MD0

Input This pin controls the processor mode. Connect this pin to VCC.

MD1

MD1

Input Connect this pin to Vss.

RESET

Reset input

Input The microcomputer is reset when “L” level is applies to this pin.

XIN

XOUT

Clock input

Clock output

Input

Output

These are input and output pins of the internal clock generating circuit. Connect a

ceramic or quartz- crystal resonator between the XIN and XOUT pins. When an

external clock is used, the clock source should be connected to the XIN pin, and the

XOUT pin should be left open.

BYTE

External data bus width

select input

Input

This pin determines whether the external data bus has an 8-bit width or 16-bit width

for the memory expansion mode or microprocessor mode. The width is 16 bits when

“L” signal is input, and 8 bits when “H” signal is input.

AVcc,

AVss

Analog power supply input

— Power supply input pin for the A-D converter. Connect AVcc to Vcc, and AVss to Vss

externally.

VREF

Reference voltage input

Input This is the reference voltage input pin for the A-D converter.

A0–A7

Low-order address

Output The low-order 8 bits of address (A0–A7) are output.

A8–A15/

Middle-order address/

MA0–MA7 DRAM address

Output The middle-order 8 bits of address (A8–A15) are input/output. While DRAM space is

accessed, multiplexed address (MA0–MA7) is output.

A16–A23/ High-order address/

MA8–MA11 DRAM address

Output The high-order 8 bits of address (A16–A23) are output. While DRAM space is ac-

cessed, multiplexed address (MA8–MA11) is output.

D0–D7

Low-order data

I/O The low-order 8 bits of data (D0–D7) are input/output.

P20/D8–

P27/D15

I/O port P2/

High-order data

I/O s When 8-bit external data bus is used (BYTE = “H” level)

Port P2 is an 8-bit I/O port.

s When 16-bit external data bus is used (BYTE = “L” level)

The high-order 8 bits (D8–D15) are input/output.

P30/RDY,

RD,

BLW,

P33/BHW

Memory control signal I/O

Input

Output

Output

Output

While the input level at pin RDY is “L”, the microcomputer is placed in the ready

state. While pin RD is at “L” level, the microcomputer reads out data and instruc-

tion codes. Also, pin RDY can function as a programmable I/O port pin (P30) by

software.

s When 8-bit external data bus is used (BYTE = “H” level)

While pin BLW is at “L” level, the microcomputer writes data.

s When 16-bit external data bus is used (BYTE = “L” level)

While pin BLW is at “L” level, the microcomputer writes data into an even-

numbered address.

While pin BHW is at “L” level, the microcomputer writes data into an odd-

numbered address.

P40/ALE,

P41/φ1,

P42/TC,

P43/HOLD,

P44/HLDA

I/O port P4

Output

Output

I/O

Input

Output

Signal ALE is used to latch an address. φ1 has the same period as internal clock φ.

Pin P42 functions as a programmable I/O port pin.

While the input level at pin HOLD is at “L” level, the microcomputer is placed in the

hold state. Signal HLDA is used to inform the external that the microcomputer

enters the hold state. By software, pin ALE, clock φ1 output pin, and pins HOLD,

HLDA function as programmable I/O port pins (P40, P41, P43, P44). Pin P42 also

functions as pin TC.

P50–P57 I/O port P5

I/O Port P5 is an 8-bit I/O port. These pins also function as I/O pins for timers A0, A2,

and pulse output pins for the real-time output.

P60–P66 I/O port P6

I/O Port P6 is a 7-bit I/O port. These pins also function as I/O pins for timers A1, A3,

A4, input pins for DMA requests, and output pins for DMA acknowledge signals.

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