116A datasheet(21/102 Pages) RENESAS

21 / 102 page

REJ03B0297-0100

Rev.1.00

Page 21 of 99

Jul 16, 2010

R32C/116A Group

1. Overview

Table 1.16

Pin Definitions and Functions (2/4)

Function

Symbol

I/O

Description

Bus control pins

BC0/D0, BC2/D1

I/O

Output of byte control (

BC0 and BC2) and input/output of

data (D0 and D1) by time-division while accessing an

external memory space with multiplexed bus

CS0 to CS3

Chip select output

WR0/WR1/WR2/

WR3,

WR/BC0/BC1/

BC2/BC3,

Output of write, byte control, and read signals. Either

WRx

WR and BCx can be selected by a program.

Data is read when

RD is low.

• When

WR0, WR1, WR2, WR3, and RD are selected,

data is written to the following address:

4n+0, when

WR0 is low

4n+1, when

WR1 is low

4n+2, when

WR2 is low

4n+3, when

WR3 is low

on 32-bit external data bus

an even address, when

WR0 is low

an odd address, when

WR1 is low

on 16-bit external data bus

• When

WR, BC0, BC1, BC2, BC3, and RD are selected,

data is written, when

WR is low

and

the following address is accessed:

4n+0, when

BC0 is low

4n+1, when

BC1 is low

4n+2, when

BC2 is low

4n+3, when

BC3 is low

on 32-bit external data bus

an even address, when

BC0 is low

an odd address, when

BC1 is low

on 16-bit external data bus

ALE

Latch enable signal in multiplexed bus format

HOLD

The MCU is in a hold state while this pin is held low

HLDA

This pin is driven low while the MCU is held in a hold state

RDY

Bus cycle is extended by the CPU if this pin is low on the

falling edge of the BCLK

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