M37733S4BFP datasheet(4/36 Pages) MITSUBISHI

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MITSUBISHI MICROCOMPUTERS

M37733S4BFP

16-BIT CMOS MICROCOMPUTER

New

product

PIN DESCRIPTION

XIN

Clock input

Input

XOUT

Clock output

Output

Name

Input/Output

Functions

Vcc,

Power source

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

Vss

CNVss

CNVss input

Input

Connect to Vcc.

_____

RESET

Reset input

Input

When “L” level is applied to this pin, the microcomputer enters the reset state.

These are pins of main-clock generating circuit. Connect a ceramic resonator or a quartz-crystal

oscillator between XIN and XOUT. When an external clock is used, the clock source should be

connected to the XIN pin, and the XOUT pin should be left open.

Enable output

Output

When output level of E signal is “L”, data/instruction read or data write is performed.

BYTE

Bus width

Input

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

selection input

The data bus has a 16-bit width when “L” signal is input and an 8-bit width when “H” signal

is input.

AVcc,

Analog power

Power source input pin for the A-D converter. Externally connect AVcc to Vcc and AVss to Vss.

AVss

source input

VREF

Reference

Input

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

voltage input

P00/A0 –

Address (low-

Output

Address (A0 – A7) is output.

P07/A7

order) output

P10/A8/D8 – Address (middle

I/O

When the BYTE pin is set to “L” and external data bus has a 16-bit width, high-order data

P17/A15/D15 -order)

(D8 – D15) is input/output or an address (A8 – A15) is output. When the BYTE pin is “H” and an

output/data

external data bus has an 8-bit width, only address (A8 – A15) is output.

(high-order) I/O

P20/A16/D0 – Address (high-

I/O

Low-order data (D0 – D7) is input/output or an address (A16 – A23) is output.

P27/A23/D7

order)

output/data

(low-order) I/O

P30/R/W

Read/Write

Output

“H” indicates the read status and “L” indicates the write status.

output

___

P31/BHE

Byte high

Output

“L” is output when an odd-numbered address is accessed.

enable output

P32/ALE

Address latch

Output

This is used to retrieve only the address from address and data multiplex signal.

enable output

____

P33/HLDA

Hold acknow-

Output

This outputs “L” level when the microcomputer enters hold state after a hold request is accepted.

ledge output

____

HOLD

Hold request

Input

____

This is an input pin for HOLD request signal. The microcomputer enters into hold state while this

input

signal is “L”.

___

RDY

Ready input

Input

___

This is an input pin for RDY signal. The microcomputer enters into ready state while this signal is

“L”.

P42/

Clock output

Output

This pin outputs the clock

P43 – P47

I/O port P4

I/O

These pins become a 5-bit I/O port. An I/O direction register is available so that each pin can be

programmed for input or output. These ports are in the input mode when reset.

P50 – P57

I/O port P5

I/O

In addition to having the same functions as port P4, these pins also function as I/O pins for timers

A0 to A3 and input pins for key input interrupt input (KI0 – KI3).

P60 – P67

I/O port P6

I/O

In addition to having the same functions as port P4, these pins also function as I/O pins for timer

___

A4, input pins for external interrupt input (INT0 – INT2) and input pins for timers B0 to B2. P67 also

functions as sub-clock

SUB

output pin.

P70 – P77

I/O port P7

I/O

In addition to having the same functions as port P4, these pins function as input pins for A-D

converter. P72 to P75 also function as I/O pins for UART2. Additionally, P76 and P77 have the

function as the output pin (XCOUT) and the input pin (XCIN) of the sub-clock (32 kHz) oscillation

circuit, respectively. When P76 and P77 are used as the XCOUT and XCIN pins, connect a resonator

or an oscillator between the both.

P80 – P87

I/O port P8

I/O

In addition to having the same functions as port P4, these pins also function as I/O pins for UART

0 and UART 1.

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