Hitachi H8/3690 Manual De Usuario
Rev. 1.0, 07/01, page 114 of 372
9.1.4
Port Pull-Up Control Register 1(PUCR1)
PUCR1 controls the pull-up MOS in bit units of the pins set as the input ports.
Bit
Bit Name
Initial Value
R/W
Description
7
6
5
4
3
2
1
0
PUCR17
PUCR16
PUCR15
PUCR14
−
PUCR12
PUCR11
PUCR10
0
0
0
0
1
0
0
0
R/W
R/W
R/W
R/W
−
R/W
R/W
R/W
Only bits for which PCR1 is cleared are valid. The pull-up
MOS of P17 to P14 and P12 to P10 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.
MOS of P17 to P14 and P12 to P10 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.
Bit 3 is a reserved bit. This bit is always read as 1 and
cannot be modified.
cannot be modified.
9.1.5
Pin Functions
The correspondence between the register specification and the port functions is shown below.
P17/
IRQ3/TRGV pin
Register
PMR1
PCR1
Bit Name
IRQ3
PCR17
Pin Function
Setting value 0
0
P17 input pin
0
1
P17 output pin
1
X
IRQ3
input/TRGV input pin
Legend X: Don't care.
P16/
IRQ2 pin
Register
PMR1
PCR1
Bit Name
IRQ2
PCR16
Pin Function
Setting value 0
0
P16 input pin
0
1
P16 output pin
1
X
IRQ2
input pin
Legend X: Don't care.