GMS81C2012K datasheet(42/107 Pages) HYNIX

42 / 107 page

GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

MAR. 2000 Ver 1.00

R7 and R7IO register: R7 is a 4-bit bidirectional I/O port

(address 0CEH). Each port can be set individually as input

and output through the R7IO register (address 0CFH).

R73~R70 ports are multiplexed with Analog Input Port

AN8~AN11). R74, R75 ports are alternate function of

SXI, SXO ports

. R74, R75 ports can be set individually as

input and output through the R7IO register.

The control register R7FUNC (address 0F8H) controls to

select alternate function. After reset, this value is "0", port

may be used as general I/O ports. To select alternate func-

tion such as Analog Input, write "1" to the corresponding

bit of R7FUNC. Regardless of the direction register R7IO,

R7FUNC is selected to use as alternate functions, port pin

can be used as a corresponding alternate features.

Port Pin

Alternate Function

R70

R71

R72

R73

SXI

SXO

AN8 (ADC input 8)

AN9 (ADC input 9)

AN10 (ADC input 10)

AN11 (ADC input 11)

R74(included Internal Pull-up Resister)

R75(included Internal Pull-up Resister)

R7 Function Selection Register

R7FUNC

ADDRESS : 0F8H

RESET VALUE : ----0000B

0: R70

1: AN8

0: R71

1: AN9

0: R73

1: AN11

0: R72

1: AN10

R7 Direction Register

R7IO

ADDRESS : 0CFH

RESET VALUE : --000000B

Port Direction

0: Input

1: Output

R6 Data Register

ADDRESS: 0CEH

RESET VALUE: Undefined

R73 R72 R71 R70

Input / Output data

R74

R75

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