P345Con Port3[4:5] Control Register - Samsung S3F80JB User Manual

S3F80JB
P345CON
— Port3[4:5] Control Register
Bit Identifier
Reset Value
Read/Write
Addressing Mode
.7 and .6
.5 and .4
.3 and .1
.0
NOTE: After CPU reset, P3.4 and P3.5 will be Open-drain output mode by the reset value of P345CON register at E1H,
Set1, Bank1. P345CON will be initialized as "50h" to set P3.4 into the open-drain output mode after reset operation.
Port4 control register P4CON will be selected by the reset value of P345CON.0 bit. If you use the Port4 input and
output mode, set P345CON.0 to "1".
.7 .6
0 1
R/W R/W
Register addressing mode only
P3.5 Mode Selection Bits
0 0 C-MOS input mode
0 1 Open-drain output mode
1 0 Push-pull output mode
1 1 C-MOS input with pull up mode
P3.4 Mode Selection Bits
0 0 C-MOS input mode
0 1 Open-drain output mode
1 0 Push-pull output mode
1 1 C-MOS input with pull up mode
Not used for S3F80JB.
Port 4 Control Register Selection Bit
0 P4CON Register selection
1 P4CONH/P4CONL Register selection
.5 .4 .3
0 1
R/W R/W
CONTROL REGISTERS
E1H Set1 Bank1
.2 .1
– – –
– – –
.0
0
R/W
4-33