HMS87C13042A Datasheet, PDF(40/88 Page) Hynix Semiconductor

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HMS87C13042A Datasheet, PDF (40/88 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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HMS87C130XA/120XA/110XA

9.4 RD and RDIO registers

RD is a 4-bit bidirectional I/O port (address C6H). Each

pin can be set individually as input and output through the

RDIO register (address C7H)

And RD0, RD1 have a function of pull-up transistor by set-

ting the PUPSEL2 and PUPSEL3 of PUPSEL register.

RD Data Register

ADDRESS : C6H

RESET VALUE : Undefined

- RD3 RD2 RD1 RD0

RD Direction Register

RDIO

INPUT / OUTPUT DATA

ADDRESS : C7H

RESET VALUE : -----0000

Pull-up Selection Register

PUPSEL

ADDRESS : CCH

RESET VALUE : ----0000

PUPSEL3 PUPSEL2 -

RD1 Pull-up

0 : No Pull-up

1 : With Pull-up

RD0 Pull-up

0 : No Pull-up

1 : With Pull-up

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

Figure 9-5 Registers of Port RD

Apr. 2001 ver1.0

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