HD6417606 RENESAS [Renesas Technology Corp], HD6417606 Datasheet - Page 390

• Manufacturer Part Number: HD6417606
• Manufacturer: RENESAS [Renesas Technology Corp]

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.
Table 15.1 Port A Data Register H (PADRH) Read/Write Operation
• Bits 9 to 0 in PADRH
Rev. 4.00 Sep. 13, 2007 Page 364 of 502
REJ09B0239-0400
Bit
15 to
10
9
8
7
6
5
4
3
2
1
0
Pin Function
General input
General output
Other functions
Bit Name

PA25DR
PA24DR
PA23DR
PA22DR
PA21DR
PA20DR
PA19DR
PA18DR
PA17DR
PA16DR
PAIORH
0
1
*
Initial
Value
All 0
0
0
0
0
0
0
0
0
0
0
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Read
Pin state
PADRH value
PADRH value
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
See table 15.1.
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.