M306H2FCFP datasheet(7/251 Pages) RENESAS

7 / 251 page

Rev. 1.0

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

with DATA ACQUISITION CONTROLLER

MITSUBISHI MICROCOMPUTERS

M306H2FCFP

Table 1.5.2 Pin Description

VCC, VSS

CNVSS

Signal name

Power supply

input

CNVSS

Supply 4.75 to 5.25 V to the Vcc pin. Supply 0 V to the Vss pin.

Function

Connect this pin to VSS.

Pin name

Input

I/O type

XIN

XOUT

Clock input

Clock output

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

Input

Output

Reset input

A “L” on this input resets the microcomputer.

Input

RESET

BYTE

External data

bus width

select input

This pin selects the width of an external data bus.

A 16-bit width is

selected when this input is “L”; an 8-bit width is selected when this input

is “H”. This input must be fixed to either “H” or “L”. Connect this pin to

the VSS pin when not using external data bus.

Input

AVCC

Analog power

supply input

This pin is a power supply input for the A-D converter. Connect this

pin to VCC.

XOUT pin open.

VREF

Reference

voltage input

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

Input

P00 to P07

I/O port P0

This is an 8-bit CMOS I/O port. It has an input/output port direction

individually. When used for input in signal-chip mode, the port can be

set to have or not have a pull-up resistor in units of four bits by software.

In memory expansion mode, selection of the internal pull-resistor in not

available.

Input/output

AVSS

This pin is a power supply input for the A-D converter. Connect this

pin to VSS.

Analog power

supply input

P10 to P17

I/O port P1

This is an 8-bit I/O port equivalent to P0. Pins in this port also function

as external interrupt pins as selected by software.

Input/output

D0 to D7

When set as a separate bus, these pins input and output data (D0–D7).

Input/output

D8 to D15

When set as a separate bus, these pins input and output data (D8–D15).

Input/output

P20 to P27

I/O port P2

This is an 8-bit I/O port equivalent to P0.

Input/output

A0 to A7

These pins output 8 low-order address bits (A0–A7).

Output

A0/D0 to

A7/D7

If the external bus is set as an 8-bit wide multiplexed bus, these pins

input and output data (D0–D7) and output 8 low-order address bits

(A0–A7) separated in time by multiplexing.

Input/output

A0, A1/D0

to A7/D6

If the external bus is set as a 16-bit wide multiplexed bus, these pins

input and output data (D0–D6) and output address (A1–A7) separated

in time by multiplexing. They also output address (A 0).

Output

Input/output

P30 to P37

I/O port P3

This is an 8-bit I/O port equivalent to P0.

Input/output

A8 to A15

These pins output 8 middle-order address bits (A8–A15).

Output

A8/D7,

A9 to A15

If the external bus is set as a 16-bit wide multiplexed bus, these pins

input and output data (D7) and output address (A8) separated in time

by multiplexing. They also output address (A 9–A15).

Input/output

Output

P40 to P47

I/O port P4

This is an 8-bit I/O port equivalent to P0.

Input/output

Output

CS0 to CS3,

A16 to A19

These pins output CS0–CS3 signals and A16–A19. CS0–CS3 are chip

select signals used to specify an access space. A16–A19 are 4 high-

order address bits.

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