GMS81C2020 Datasheet, PDF(46/92 Page) Hynix Semiconductor – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

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GMS81C2020 Datasheet, PDF (46/92 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

12.7 R5 and R5IO registers

R5 is an 8-bit bidirectional I/O port (address CAH). Each

pin can be set individually as input and output through the

R5IO register (address CBH).In addition, Port R5 is multi-

plexed with Serial Peripheral Interface (SPI). The control

Peripheral Interface function.After reset, the R5IO register

value is "0", port may be used as general I/O ports. To se-

lect Serial Peripheral Interface function, write "1" to the

corresponding bit of R5FUNC.

R5 Data Register

ADDRESS : CAH

RESET VALUE : Undefined

R57 R56 R55 R54 R53 R52 R51 R50

R5 Direction Register

R5IO

INPUT / OUTPUT DATA

ADDRESS : CBH

RESET VALUE : 00000000

R5 Function Selection Register

R5FUNC

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

ADDRESS : F6H

RESET VALUE : -0000---

- PWM1O SOUT SIN SCLK

0 : R56

1 : PWM1O/T1O

0 : R55

1 : SOUT

0 : R53

1 : SCLK

0 [R5IO.3] : SCLKO

0 : R54 1 [R5IO.3] : SCLKI

1 : SIN

Figure 12-7 Registers of Port R5

PORT

R56/

PWM1O/

T1O

R55/SOUT

R54/SIN

R53/SCLK

R5FUNC

[6:3]

0 [R5IO.3]

SCLKO

1 [R5IO.3]

SCLKI

Description

R56 (Normal I/O Port)

PWM1 Data Output / Timer

1 Data Output

R55 (Normal I/O Port)

SPI Serial Data Output

R54 (Normal I/O Port)

SPI Serial Data Input

R53 (Normal I/O Port)

SPI Synchronous Clock

Output

SPI Synchronous Clock

Input

Table 12-1 Registers of Port R5FUNC

12.8 R6 and R6IO registers

R6 is an 8-bit bidirectional I/O port (address CCH). Each

port can be set individually as input and output through the

R6IO register (address CDH).

R67~R60 ports are multiplexed with Analog Input Port

( AN7~AN0 )..

R6 Data Register

ADDRESS : CCH

RESET VALUE : Undefined

R67 R66 R65 R64 R63 R62 R61 R60

R6 Direction Register

R6IO

INPUT / OUTPUT DATA

ADDRESS : CDH

RESET VALUE : 00000000

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

R6 Function Selection Register

R6FUNC

ADDRESS : F7H

RESET VALUE : 00000000

ANSEL7 ANSEL6 ANSEL5 ANSEL4 ANSEL3 ANSEL2 ANSEL1 ANSEL0

0 : R64

1 : AN4

0 : R65

1 : AN5

0 : R66

1 : AN6

0 : R67

1 : AN7

0 : R60

1 : AN0

0 : R61

1 : AN1

0 : R62

1 : AN2

0 : R63

1 : AN3

Figure 12-8 Registers of Port R6

preliminary

Nov. 1999 Ver 0.0

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