SH7606 Datasheet, PDF (390/532 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7606 Series

Section 15 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 15.1 shows
the reading/writing function of the port A data register H.
Initial
Bit Bit Name Value R/W Description
15 to 
10
All 0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
9
PA25DR 0
R/W See table 15.1.
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
Table 15.1 Port A Data Register H (PADRH) Read/Write Operation
• Bits 9 to 0 in PADRH
Pin Function PAIORH
General input 0
Read
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. 4.00 Sep. 13, 2007 Page 364 of 502
REJ09B0239-0400