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8. I/O Ports
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
Legend: * Don't care
Notes:
H8/3857 Group: n = 7 to 0
H8/3854 Group: n = 7, 5, 2 to 0
8.3
Port 2
Some port 2 functions differ between the H8/3857 Group and the H8/3854 Group.
The UD function multiplexed with the P2
the H8/3854 Group.
POF1 in PMR2 is also a function of the H8/3857 Group only.
8.3.1
Overview
Port 2 is an 8-bit I/O port. The H8/3857 Group port 2 pin configuration is shown in figure 8.2 (a),
and the H8/3854 Group port 2 pin configuration in figure 8.2 (b).
Figure 8.2 (a) H8/3857 Group Port 2 Pin Configuration
Rev.3.00 Jul. 19, 2007 page 182 of 532
REJ09B0397-0300
0
0
1
Off
On
pin is provided only in the H8/3857 Group, and not in
1
Port 2
1
*
Off
P2
7
P2
6
P2
5
P2
4
P2
3
P2
2
P2 /UD
1
P2 /IRQ /ADTRG
0
4
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