GMS87C2020 datasheet(47/92 Pages) HYNIX

47 / 92 page

Hyundai Micro Electronics

GMS81C2020/GMS81C2120

Nov. 1999 Ver 0.0

preliminary

The control register R6FUNC (address F7H) 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 Analog Input, write "1" to the corresponding

bit of R6FUNC. Regardless of the direction register R6IO,

R6FUNC is selected to use as alternate functions, port pin

can be used as a corresponding alternate features

(AN7~AN0)

12.9 R7 and R7IO registers

R7 is an 4-bit bidirectional I/O port (address CEH). Each

port can be set individually as input and output through the

R7IO register (address CFH).

R73~R70 ports are multiplexed with Analog Input Port

AN11~AN8 )..

Figure 12-9 Registers of Port R6

The control register R7FUNC (address F8H) 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 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

R6FUNC

[7:0]

Description

R67/AN7

R67 ( Normal I/O Port )

AN7 ( ADS3~0=0111 )

R66/AN6

R66 ( Normal I/O Port )

AN6 ( ADS3~0=0110 )

R65/AN5

R65 ( Normal I/O Port )

AN5 ( ADS3~0=0101 )

R64/AN4

R64 ( Normal I/O Port )

AN4 ( ADS3~0=0100 )

R63/AN3

R63 ( Normal I/O Port )

AN3 ( ADS3~0=0011 )

R62/AN2

R62 ( Normal I/O Port )

AN2 ( ADS3~0=0010 )

R61/AN1

R61 ( Normal I/O Port )

AN1 ( ADS3~0=0001 )

R60/AN0

R60 ( Normal I/O Port )

AN0 ( ADS3~0=0000 )

PORT

R7FUNC

[7:0]

Description

R73/AN11

R73 ( Normal I/O Port )

AN11 ( ADS3~0=1011 )

R72/AN10

R72 ( Normal I/O Port )

AN10 ( ADS3~0=1010 )

R71/AN9

R71 ( Normal I/O Port )

AN9 ( ADS3~0=1001 )

R70/AN8

R70 ( Normal I/O Port )

AN8 ( ADS3~0=1000 )

R73

R72

R71

R70

INPUT / OUTPUT DATA

0 : INPUT PORT

1 : OUTPUT PORT

DIRECTION SELECT

R7 Data Register

ADDRESS : CEH

RESET VALUE : Undefined

R7 Direction Register

R7IO

ADDRESS : CFH

RESET VALUE : ----0000

ANSEL8

R7 Function Selection Register

R7FUNC

ADDRESS : F8H

RESET VALUE : ----0000

ANSEL9

ANSEL10

ANSEL11

0 : R70

1 : AN8

0 : R71

1 : AN9

0 : R72

1 : AN10

0 : R73

1 : AN11

GMS87C2020 Datasheet(PDF) 47 Page - Hynix Semiconductor

GMS87C2020 Datasheet(HTML) 47 Page - Hynix Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Datasheet Download

Link URL