GMS81C2012 datasheet(40/107 Pages) HYNIX

40 / 107 page

GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

MAR. 2000 Ver 1.00

R1 and R0IO register: R1 is an 8-bit high-voltage CMOS

bidirectional I/O port (address 0C2H). Each port can be set

individually as input and output through the R1IO register

(address 0C3H). Each port can directly drive a vacuum flu-

orescent display.

R2 and R2IO register: R2 is an 8-bit high-voltage CMOS

bidirectional I/O port (address 0C4H). Each port can be set

individually as input and output through the R2IO register

(address 0C5H). Each port can directly drive a vacuum flu-

orescent display.

R3 and R3IO register: R3 is a 6-bit high-voltage CMOS

bidirectional I/O port (address 0C6H). Each port can be set

individually as input and output through the R3IO register

(address 0C7H).

R4 and R4IO register: R4 is a 4-bit bidirectional I/O port

(address 0C8H). Each port can be set individually as input

and output through the R4IO register (address 0C9H). R40

port is multiplexed with Timer 0 Output Port (T0O).

The control register R4FUNC (address 0F5H) 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 Timer 0 Output, write "1" to the corresponding

bit of R4FUNC. Regardless of the direction register R4IO,

R4FUNC is selected to use as alternate functions, port pin

can be used as a corresponding alternate features (T0O)

R1 Data Register

ADDRESS: 0C2H

RESET VALUE: Undefined

R17 R16 R15 R14 R13 R12 R11 R10

Port Direction

R1 Direction Register

R1IO

ADDRESS : 0C3H

RESET VALUE : 00H

0: Input

1: Output

Input / Output data

R2 Data Register

ADDRESS: 0C4H

RESET VALUE: Undefined

R27 R26 R25 R24 R23 R22 R21 R20

Port Direction

R2 Direction Register

R2IO

ADDRESS : 0C5H

RESET VALUE : 00H

0: Input

1: Output

Input / Output data

Port Pin

Alternate Function

R40

T0O (Timer 0 Compare Output Port)

R3 Data Register

ADDRESS: 0C6H

RESET VALUE: Undefined

R35 R34 R33 R32 R31 R30

Port Direction

R3 Direction Register

R3IO

ADDRESS : 0C7H

RESET VALUE : --000000B

0: Input

1: Output

Input / Output data

R4 Data Register

ADDRESS: 0C8H

RESET VALUE: Undefined

R43 R42 R41 R40

Port Direction

R4 Direction Register

R4IO

ADDRESS : 0C9H

RESET VALUE : ----0000B

0: Input

1: Output

Input / Output data

R4 Function Selection Register

R4FUNC

ADDRESS : 0F5H

RESET VALUE : -------0B

0: R40

1: T0O

T0O

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