HD64F3687HV Datasheet, PDF (159/538 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 9 I/O Ports
9.4.4 Port Pull-Up Control Register 5 (PUCR5)
PUCR5 controls the pull-up MOS in bit units of the pins set as the input ports.
Initial
Bit
Bit Name Value R/W Description
7, 6 
All 0

Reserved
These bits are always read as 0.
5
PUCR55 0
4
PUCR54 0
3
PUCR53 0
2
PUCR52 0
R/W Only bits for which PCR5 is cleared are valid. The pull-up
R/W ^{MOS of the corresponding pins enter the on-state when}
these bits are set to 1, while they enter the off-state when
R/W _{these bits are cleared to 0.}
R/W
1
PUCR51 0
R/W
0
PUCR50 0
R/W
9.4.5 Pin Functions
The correspondence between the register specification and the port functions is shown below.
P57/SCL pin
Register
ICCR1
Bit Name
ICE
Setting Value 0
1
Legend: X: Don't care.
PCR5
PCR57
0
1
X
Pin Function
P57 input pin
P57 output pin
SCL I/O pin
SCL performs the NMOS open-drain output, that enables a direct bus drive.
Rev.5.00 Nov. 02, 2005 Page 125 of 500
REJ09B0027-0500