M37902FGCHP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M37902FGCHP

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

M37902FCCHP, M37902FGCHP, M37902FJCHP

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

PIN DESCRIPTION (MICROCOMPUTER MODE)

Input/

Pin

Name

Output

Functions

Vcc, Vss Power supply input

— Apply 5 V±0.5 V to Vcc, and 0 V to Vss.

MD0

MD0

Input This pin controls the processor mode. Connect this pin to VSS for the single-chip

mode or memory expansion mode, and VCC for the microprocessor mode.

MD1

MD1

Input Connect this pin to Vss.

RESET

Reset input

Input The microcomputer is reset when “L” level is applied 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. When BYTE = Vss level, by

the register setting, the external data bus for each of areas CS1 to CS3 can have a

width of 8 bits.

VCONT

Filter circuit connection

— When using the PLL frequency multiplier, connect this pin to the filter circuit. When

not using, this pin should be left open.

AVcc,

AVss

Analog power supply input

— Power supply input pins for the A-D converter and the D-A 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 and the D-A converter.

P00–P07 I/O port P0

I/O s 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 pins enter the input mode at

reset.

s In memory expansion and microprocessor modes

Address (A16–A23) is output. These pins also function as I/O port pins according

to the register setting.

P10–P17 I/O port P1

I/O s In single-chip mode

These pins have the same functions as port P0.

s In memory expansion and microprocessor modes

The low-order 8 bits of data (D0–D7) are input/output. When the external data bus

has an 8-bit width, address (LA0–LA7) output and data (D0–D7) input/output can

be performed with the time-sharing method, according to the register setting.

P20–P27 I/O port P2

I/O s In single-chip mode or When 8-bit external data bus is used in memory expansion

mode and microprocessor mode

These pins have the same functions as port P0.

s When the 16-bit external data bus is used in memory expansion or microproce-

ssor mode

The high-order 8 bits of data (D8–D15) are input or output.

P30–P33 I/O port P3

I/O s In single-chip mode

These pins have the same functions as port P0.

s In memory expansion mode

P30 functions as an I/O port pin; and P31, P32, and P33 function as the output

pins of RD, BLW, BHW, respectively. P30 also functions as an output pin of RDY

according to the register setting. When the external data bus has a width of 8 bits,

the BHW pin functions as an I/O port pin (P33).

s In microprocessor mode

P30 functions as an input pin of RDY; and P31,P32, P33 function as the output

pins of RD, BLW, BHW, respectively. P30 also functions as an I/O port pin accord-

ing to the register setting. When the external data bus has a width of 8 bits,

the BHW pin functions as an I/O port pin (P33).

P40–P47 I/O port P4

I/O s In single-chip mode

These pins have the same functions as port P0.

s In memory expansion mode

P40–P47 function as I/O port pins. According to the register setting, these pins

function as output pins or input pins of ALE, φ1, HLDA, HOLD, CS0–CS3, respec-

tively.

s In microprocessor mode

P40–P44 function as output or input pins of ALE, φ1, HLDA, HOLD, CS0, and

P45–P47 as I/O port pins, respectively. According to the register setting, P40–P43

also function as I/O port pins, and P45–P47 as output pins of CS1–CS3.

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