Abov A96G166, User Manual, Page: 48 / 247

5. I/O ports A96G166/A96A166/A96S166 User’s manual
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5.4 P2 port
5.4.1 P2 port description
P2 is an 8-bit I/O port. P2 control registers consist of P2 data register (P2), P2 direction register
(P2IO), P2 pull-up resistor selection register (P2PU) andP2 open-drain selection register
(P2OD).Refer to the port function selection registers for the P2 function selection.
5.4.2 Register description for P2
P2 (P2 Data Register): 90H
7 6 5 4 3 2 1 0
–
P26 P25 P24 P23 P22 P21 P20
–
R/W R/W R/W R/W R/W R/W R/W
Initial value: 00H
P2[6:0] I/O Data
P2IO (P2 Direction Register): B9H
7 6 5 4 3 2 1 0
–
P26IO P25IO P24IO P23IO P22IO P21IO P20IO
–
R/W R/W R/W R/W R/W R/W R/W
Initial value: 00H
P2IO[6:0] P2 Data I/O Direction
0
Input
1 Output
NOTE: EC0 (P26) function is available only when P31 is not EC0
function and EC0 is used in TIMER0.
P2PU (P2 Pull-up Resistor Selection Register): AEH
7 6 5 4 3 2 1 0
–
P26PU P25PU P24PU P23PU P22PU P21PU P20PU
–
R/W R/W R/W R/W R/W R/W R/W
Initial value: 00H
P2PU[6:0] Configure Pull-up Resistor of P2 Port
0
Disable
1 Enable
P2OD (P2 Open-drain Selection Register): 93H
7 6 5 4 3 2 1 0
–
P26OD P25OD P24OD P23OD P22OD P21OD P20OD
–
R/W R/W R/W R/W R/W R/W R/W
Initial value: 00H
P2OD[6:0] Configure Open-drain of P2 Port
0
Push-pull output
1 Open-drain output