(3) Control registers
(a) Port 0 mode register (PM0)
Read and write in 8-bit units and bitwise are enabled.
FFH
After reset:
7
PM0
PM07
PM0n
0
1
(b) Pull-up resistance option register 0 (PU0)
Read and write in 8-bit units and bitwise are enabled.
Figure 14-3. Format of Pull-up Resistance Option Register 0 (PU0)
00H
After reset:
7
PU0
PU07
PU0n
0
1
CHAPTER 14
Figure 14-2. Format of Port 0 Mode Register (PM0)
R/W
Address: FFFFF020H
6
5
PM06
PM05
Output mode
Input mode
R/W
Address: FFFFF080H
6
5
PU06
PU05
Control of On-Chip Pull-Up Resistance Connection
Do not connect
Connect
PORT FUNCTION
4
3
PM04
PM03
PM02
Control of I/O Mode
4
3
PU04
PU03
PU02
2
1
0
PM01
PM00
2
1
0
PU01
PU00
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