CHAPTER 14 PORT FUNCTION
User’s Manual U13850EJ4V0UM
391
(c) Port 3 function register (PF3)
PF3 can be read/written in 8-/1-bit units.
Figure 14-22. Port 3 Function Register (PF3)
After reset:
00H
R/W
Address: FFFFF0A6H
7
6
5
4
3
2
1
0
PF3
0
0
0
PF34
PF33
0
0
0
PF3n
Control of normal output/N-ch open-drain output (n = 3, 4)
0
Normal output
1
N-ch open-drain output
(3) Block diagram (Port 3)
Figure 14-23. Block Diagram of P30 to P32 and P35 to P37
P-ch
WR
PM
WR
PORT
RD
WR
PU
V
DD
Selector
Output latch
(P3n)
PM3n
PM3
PU3n
PU3
Internal bus
Alternate function
P30/TI00
P31/TI01
P32/TI10/SI4
P35/TO1/A14
P36/TI4/TO4/A15
P37/TI5/TO5
Remarks 1.
PU3: Pull-up resistor option register 3
PM3: Port 3 mode register
RD:
Port 3 read signal
WR:
Port 3 write signal
2.
n = 0 to 2, 5 to 7
Содержание MPD703030A
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