HD64F3670 Datasheet, PDF (125/323 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

9.3.4 Port Pull-Up Control Register 5 (PUCR5)
PUCR5 controls the pull-up MOS in bit units of the pins set as the input ports.
Bit Bit Name Initial Value R/W
7
0

6
0

5 PUCR55 0
R/W
4 PUCR54 0
R/W
3 PUCR53 0
R/W
2 PUCR52 0
R/W
1 PUCR51 0
R/W
0 PUCR50 0
R/W
Description
Reserved
These bits are always read as 0.
Only bits for which PCR5 is cleared are valid. The pull-up
MOS of the corresponding pins enter the on-state when
these bits are set to 1, while they enter the off-state when
these bits are cleared to 0.
9.3.5 Pin Functions
The correspondence between the register specification and the port functions is shown below.
P57 pin
Register PMR5
Bit Name POF7
Setting Value X
0
1
Legend X: Don't care.
PCR5
PCR57
0
1
1
Pin Function
P57 input pin
CMOS output
NMOS open-drain output
P56 pin
Register PMR5
Bit Name POF6
Setting Value X
0
1
Legend X: Don't care.
PCR5
PCR56
0
1
1
Pin Function
P56 input pin
CMOS output
NMOS open-drain output
Rev. 2.0, 03/02, page 101 of 298