Pin States; Mos Input Pull-Up; Table 8.10 Port 3 Pin States - Renesas H8/3847R Series Hardware Manual

8.4.4

Pin States

Table 8.10 shows the port 3 pin states in each operating mode.

Table 8.10 Port 3 Pin States

Pins Reset
P3 /AEVL High-
7
P3 /AEVH impedance
6
P3 /TXD
5 31
P3 /RXD
4 31
P3 /SCK
3 31
/RESO *
2
P3 Reset output
2
*
3
P3 High-
2
/UD *
2
P3 impedance
1
/UD/EXCL *
3
P3
1
P3 /PWM
0
Notes: 1. A high-level signal is output when the MOS pull-up is in the on state.
2. Applies to H8/3847R Group and H8/3847S Group.
3. Applies to H8/38347 Group and H8/38447 Group.
8.4.5

MOS Input Pull-Up

Port 3 has a built-in MOS input pull-up function that can be controlled by software. When a
PCR3 bit is cleared to 0, setting the corresponding PUCR3 bit to 1 turns on the MOS pull-up for
that pin. The MOS pull-up function is in the off state after a reset.
PCR3
n
PUCR3
n
MOS input pull-up
Sleep Subsleep
Retains Retains
previous previous
state state
0
0
Off
Standby Watch
High- Retains
impedance *
1
previous
state
0
1
On
Rev. 6.00 Aug 04, 2006 page 225 of 680
Section 8 I/O Ports
Subactive Active
Functional Functional
1
*
Off
(n = 7 to 0)
*: Don't care
REJ09B0145-0600