SH7618 Datasheet, PDF (490/646 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

Section 17 I/O Ports
When the pin function is general output port, if the value is written to PADRH, the value is output
from the pin; if PADRH is read, the value written to the register is directly read regardless of the
pin state.
When the pin function is general input port, not the value of register but pin state is directly read if
PADRH is read. Data can be written to PADRH but no effect on the pin state. Table 17.1 shows
the reading/writing function of the port A data register H.
Initial
Bit
Bit Name Value R/W
15 to 10 
All 0 R
9
PA25DR 0
R/W
8
PA24DR 0
R/W
7
PA23DR 0
R/W
6
PA22DR 0
R/W
5
PA21DR 0
R/W
4
PA20DR 0
R/W
3
PA19DR 0
R/W
2
PA18DR 0
R/W
1
PA17DR 0
R/W
0
PA16DR 0
R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
See table 17.1.
Table 17.1 Port A Data Register H (PADRH) Read/Write Operation
• Bits 9 to 0 in PADRH
Pin Function
General input
PAIORH Read
0
Pin state
General output 1
Other functions *
PADRH value
PADRH value
Write
Data can be written to PADRH but no effect on
the pin state.
Written value is output from the pin.
Data can be written to PADRH but no effect on
the pin state.
Rev. 6.00 Jun. 12, 2007 Page 458 of 610
REJ09B0131-0600