Pin States; Mos Input Pull-Up - Hitachi H8/3937 Series Hardware Manual

8.2.4

Pin States

Table 8-4 shows the port 1 pin states in each operating mode.
Table 8-4 Port 1 Pin States
Pins Reset
P1 /IRQ /TMIF High-
7 3
P1 /IRQ impedance
6 2
P1 /IRQ /TMIC
5 1
P1 /IRQ /ADTRG
4 4
P1 /TMIG
3
P1 /TMOFH
2
P1 /TMOFL
1
P1 /TMOW
0
Note: A high-level signal is output when the MOS pull-up is in the on state.
*
8.2.5

MOS Input Pull-Up

Port 1 has a built-in MOS input pull-up function that can be controlled by software. When a
PCR1 bit is cleared to 0, setting the corresponding PUCR1 bit to 1 turns on the MOS input pull-up
for that pin. The MOS input pull-up function is in the off state after a reset.
PCR1
n
PUCR1
n
MOS input pull-up
142
Sleep Subsleep
Retains Retains
previous previous
state state
0
0
Off
Standby Watch
High- Retains
impedance* previous
state
0
1
On
Subactive Active
Functional Functional
1
*
Off
(n = 7 to 0)
*: Don't care