32C80 datasheet(9/60 Pages) RENESAS

9 / 60 page

1. Overview

page 9

Apply 3.0 to 5.5 V to both VCC1 and VCC2 pins. Apply 0 V to the

VSS pin. VCC1

≥ VCC2(1)

Supplies power for the A/D converter. Connect the AVCC pin to

VCC1 and the AVSS pin to VSS

The microcomputer is in a reset state when "L" is applied to the

____________

RESET pin

Connect this pin to VCC1

Switches the data bus in external memory space 3. The data

bus is 16 bits long when the this pin is held "L" and 8 bits long

when the this pin is held "H". Set it to either one.

Inputs and outputs data (D0 to D7) while accessing an external

memory space with separate bus

Inputs and outputs data (D8 to D15) while accessing an external

memory space with 16-bit separate bus

Outputs address bits (A0 to A22)

Outputs inversed address bit A23

Inputs and outputs data (D0 to D7) and outputs 8 low-order

address bits (A0 to A7) by time-sharing while accessing an

external memory space with multiplexed bus

Inputs and outputs data (D8 to D15) and outputs 8 middle-order

address bits (A8 to A15) by time-sharing while accessing an

external memory space with multiplexed bus

______

Output CS0 to CS3 that are chip-select signals specifying an external space

_______

________

______

________

_____

_______

________

Outputs WRL, WRH, (WR, BHE) and RD signals. WRL and WRH

______

_______

can be switched with WR and BHE by program

________

_________

_____

WRL, WRH and RD are selected:

If external data bus is 16 bits wide, data is writtenn to an even

_______

address when WRL is held "L".

________

Data is written to an odd address when WRH is held "L".

_____

Data is read when RD is held "L".

______

________

_____

WR, BHE and RD are selected

______

Data is written to external memory space when WR is held "L".

_____

Data is read when RD is held "L".

________

An odd address is accessed when BHE is held "L".

______

________

_____

Select WR, BHE and RD for an external 8-bit data bus

ALE is a signal latching address

__________

The microcomputer is placed in a hold state while the HOLD pin

is held "L"

Outputs an "L" siganl while the microcomputer is placed in a hold state

Bus is placed in a wait state while the RDY pin is held "L"

VCC1, VCC2

VSS

AVCC

AVSS

____________

RESET

CNVSS

BYTE

D0 to D7

D8 to D15

A0 to A22

______

A23

A0/D0 to

A7/D7

A8/D8 to

A15/D15

______

CS0 to CS3

________ ______

WRL/WR

_________ ________

WRH/BHE

_____

ALE

__________

HOLD

__________

HLDA

________

RDY

Power supply

Analog power

supply input

Reset input

CNVSS

External data

bus width

select input

Bus control

pins

I/O

VCC1

VCC2

Supply

Signal name

Pin name

I/O type

Description

voltage

1.6 Pin Description

Table 1.4 Pin Description

I: Input

O: Output

I/O: Input and output

NOTE:

1. In this manual, hereafter, VCC refers to VCC1 unless otherwise noted.

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