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(b) Pull-up resistance option register 1 (PU1)
Read and write in 8-bit units and bitwise are enabled.
Figure 14-8. Format of Pull-up Resistance Option Register 1 (PU1)
After reset:
00H
R/W
7
PU1
0
PU1n
0
Do not connect
1
Connect
(c) Port 1 function register (PF1)
Read and write in 8-bit units and bitwise are enabled.
After reset:
00H
R/W
7
PF1
0
PF1n
0
Normal output
1
N-ch open drain output
Note Bit 3 is fixed as a normal output.
CHAPTER 14
Address: FFFFF082H
6
5
0
PU15
Control of On-Chip Pull-Up Resistance Connection
Figure 14-9. Format of Port 1 Function Register (PF1)
Address: FFFFF0A2H
6
5
0
PF15
Control of Normal Output/N-ch Open Drain Output
PORT FUNCTION
4
3
PU14
PU13
PU12
4
3
Note
PF14
0
PF12
2
1
0
PU11
PU10
2
1
0
PF11
PF10
335
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