83
ABOV Semiconductor Co., Ltd.
9.4 P1 Port
9.4.1 P1 Port Description
P1 is 8-bit I/O port. P1 control registers consist of P1 data register (P1), P1 direction register (P1IO), debounce enable
register (P1DB), P1 pull-up resistor selection register (P1PU) and P1 open-drain selection register (P1OD) . Refer to
the port function selection registers for the P1 function selection.
9.4.2 Register description for P1
P1 (P1 Data Register): 88H
Initial value: 00H
P1IO (P1 Direction Register): B3H
Initial value: 00H
NOTE)
1. EINT6/ENINT7/EINT11/EINT12/SS2/EC1 function
possible when input
P1PU (P1 Pull-up Resistor Selection Register): EBH
Initial value: 00H
Configure Pull-up Resistor of P1 Port
P1OD (P1 Open-drain Selection Register): 4011H (XSFR)
Initial value: 08H
Configure Open-drain of P1 Port