
HYUNDAI MicroElectronics
50
PIN Single Chip Mode Microprocessor Mode
R10/A0 I/O O
R11/A1 I/O O
R12/A2 I/O Programmable I/O Port O low 8bit address of External Memory
R13/A3 I/O O for CPU.
R14/A4 I/O O
R15/A5 I/O O
R16/A6 I/O O
R17/A7 I/O O
3.3. R2 PORT
R2 Port is composed of 8-bit programmable I/O pin.
Register Name Symbol R/W Address Initial Value
R2 I/O Direction Register R2DD W 00C5
H
0000 0000
R2 PORT Data Register R2 R/W 00C4
H
Not initialized
R2 PORT I/O DIRECTION REGISTER
R2 PORT DATA REGISTER
Determines I/O of R2 port
0 : Input
1 : Output
<00C5
H
>
R2DD
7
R2DD7
6
R2DD6
5
R2DD5
4
R2DD4
3
R2DD3
2
R2DD2
1
R2DD1
0
R2DD0
W
W
W
W
W
W
W
W
Port R2 output data
<00C4
H
>
R2
7
R27
6
R26
5
R25
4
R24
3
R23
2
R22
1
R21
0
R20
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W