Abov MC97F2664, Руководство пользователя

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MC97F2664
April 11, 2014 Ver. 1.4 81
9.6 P3 Port
9.6.1 P3 Port Description
P3 is 8-bit I/O port. P3 control registers consist of P3 data register (P3), P3 direction register (P3IO), debounce
enable register (P35DB),P3 pull-up resistor selection register (P3PU) and P3 open-drain selection register
(P3OD). Refer to the port function selection registers for the P3 function selection.
9.6.2 Register description for P3
P3 (P3 Data Register) : 98H
7 6 5 4 3 2 1 0
P37 P36 P35 P34 P33 P32 P31 P30
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P3[7:0]
I/O Data
P3IO (P3 Direction Register) : B9H
7 6 5 4 3 2 1 0
P37IO P36IO P35IO P34IO P33IO P32IO P31IO P30IO
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P3IO[7:0]
P3 Data I/O Direction
0 Input
1 Output
NOTE) EINT14/EINT15/EINT16/SS2/EC7/EC8/EC9 function
possible when input
P3PU (P3 Pull-up Resistor Selection Register) : 100BH (XSFR)
7 6 5 4 3 2 1 0
P37PU P36PU P35PU P34PU P33PU P32PU P31PU P30PU
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P3PU[7:0] Configure Pull-up Resistor of P3 Port
0 Disable
1 Enable
P3OD (P3 Open-drain Selection Register) : 1003H (XSFR)
7 6 5 4 3 2 1 0
P37OD P36OD P35OD P34OD P33OD P32OD P31OD P30OD
R/W R/W R/W R/W R/W R/W R/W R/W
Initial value : 00H
P3OD[7:0] Configure Open-drain of P3 Port
0 Push-pull output
1 Open-drain output