HD6433937 Datasheet, PDF (165/521 Pages) Hitachi Semiconductor – 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
Sleep
Subsleep Standby Watch
Subactive Active
P3₇
P3₆
P3₅/TXD₃₁
P3₄/RXD₃₁
P3₃/SCK₃₁
High-
impedance
Retains
previous
state
Retains
previous
state
High-
Retains
impedance* previous
state
Functional
P3₂/RESO
Reset output
P3₁/UD
P3₀
Note: *
High-
impedance
A high-level signal is output when the MOS pull-up is in the on state.
Functional
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
0
0
1
PUCR3_n
0
1
*
MOS input pull-up Off
On
Off
(n = 7 to 0)
*: Don’t care
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