UPD16661A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD16661A

160-OUTPUT LCD COLUMN (SEGMENT) DRIVER WITH RAM

NEC => Renesas Technology 

µPD16661A

7. CPU INTERFACE

7.1 Function of the RDY (Ready) pin

The on-chip RAM uses a single-port RAM. In order to avoid conflict between accessing from the CPU side

and reading on the liquid-crystal drive side, the RDY pin performs a wait operation on the CPU.

5 (1) Timing

A0 to A16,/UBE

/CS

/OE,/WE

Hi-z

RDY

Hi-z

Wait

Ready

Wait

(2) Connection of the RDY pin

The RDY pin uses a 3-state buffer. Externally attach a pull-up resistor to the RDY pin.

When more than one µPD16661A is used, wired-OR connect each LSI RDY pin.

CPU

Ready input

VCC2

Pull-up resistor

RDY

Column driver

RDY

Column driver

14

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