Abov MC97F2664, Руководство пользователя

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MC97F2664
78 April 11, 2014 Ver. 1.4
9.5 P2 Port
9.5.1 P2 Port Description
P2 is 8-bit I/O port. P2 control registers consist of P2 data register (P2), P2 direction register (P2IO), debounce
enable register (P2DB), P2 pull-up resistor selection register (P2PU) and P2 open-drain selection register
(P2OD). Refer to the port function selection registers for the P2 function selection.
9.5.2 Register description for P2
P2 (P2 Data Register) : 90H
7 6 5 4 3 2 1 0
P27 P26 P25 P24 P23 P22 P21 P20
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P2[7:0]
I/O Data
P2IO (P2 Direction Register) : B1H
7 6 5 4 3 2 1 0
P27IO P26IO P25IO P24IO P23IO P22IO P21IO P20IO
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P2IO[7:0]
P2 Data I/O Direction
0 Input
1 Output
NOTE) EINT8/EINT9/EINTA/EINT17/EINT18/EINT19/RXD4
function possible when input
P2PU (P2 Pull-up Resistor Selection Register) : 100AH (XSFR)
7 6 5 4 3 2 1 0
P27PU P26PU P25PU P24PU P23PU P22PU P21PU P20PU
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P2PU[7:0] Configure Pull-up Resistor of P2 Port
0 Disable
1 Enable
P2OD (P2 Open-drain Selection Register) : 1002H (XSFR)
7 6 5 4 3 2 1 0
P27OD P26OD P25OD P24OD P23OD P22OD P21OD P20OD
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P2OD[7:0] Configure Open-drain of P2 Port
0 Push-pull output
1 Open-drain output