GMS81C2020 Datasheet, PDF(44/92 Page) Hynix Semiconductor – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

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GMS81C2020 Datasheet, PDF (44/92 Pages) Hynix Semiconductor – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

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GMS81C2020/GMS81C2120

Hyundai Micro Electro nics

R00/

INT0

R00 (Normal I/O Port)

INT0 (External interrupt 0 Input

Port)

12.3 R1 and R1IO registers

R1 is an 8-bit high-voltage CMOS bidirectional I/O port

(address C2H). Each port can be set individually as input

and output through the R1IO register (address C3H). Each

port can directly drive a vacuum fluorescent display..

R1 Data Register

ADDRESS : C2H

RESET VALUE : Undefined

R17 R16 R15 R14 R13 R12 R11 R10

R1 Direction Register

R1IO

INPUT / OUTPUT DATA

ADDRESS : C3H

RESET VALUE : 00000000

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

Figure 12-3 Registers of Port R1

12.4 R2 and R2IO registers

R2 is an 8-bit high-voltage CMOS bidirectional I/O port

(address C4H). Each port can be set individually as input

and output through the R2IO register (address C5H). Each

port can directly drive a vacuum fluorescent display..

R2 Data Register

ADDRESS : C4H

RESET VALUE : Undefined

R27 R26 R25 R24 R23 R22 R21 R20

INPUT / OUTPUT DATA

R2 Direction Register

R2IO

ADDRESS : C5H

RESET VALUE : 00000000

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

Figure 12-4 Registers of Port R2

12.5 R3 and R3IO registers

R1 is an 6-bit high-voltage CMOS bidirectional I/O port

(address C6H). Each port can be set individually as input

and output through the R3IO register (address C7H).

Each port can directly drive a vacuum fluorescent display..

R3 Data Register

ADDRESS : C6H

RESET VALUE : Undefined

R35 R34 R33 R32 R31 R30

R3 Direction Register

R3IO

INPUT / OUTPUT DATA

ADDRESS : C7H

RESET VALUE : --000000

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

Figure 12-5 Registers of Port R3

12.6 R4 and R4IO registers

R4 is an 4-bit bidirectional I/O port (address C8H). Each

port can be set individually as input and output through the

R4IO register (address C9H).

R40 port is multiplexed with Timer 0 Output Port(T0O), r

R4 Data Register

ADDRESS : C8H

RESET VALUE : Undefined

- - - - R43 R42 R41 R40

R4 Direction Register

R4IO

INPUT / OUTPUT DATA

ADDRESS : C9H

RESET VALUE : ----0000

R4 Function Selection Register

R4FUNC

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

ADDRESS : F5H

RESET VALUE : -------0

T0O

0 : R40

1 : T0O

Figure 12-6 Registers of Port R4

The control register R4FUNC (address F5H) controls to se-

lect 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

preliminary

Nov. 1999 Ver 0.0

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