HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 490

• Manufacturer Part Number: HD6417618
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

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.
Table 17.1 Port A Data Register H (PADRH) Read/Write Operation
Rev. 6.00 Jun. 12, 2007 Page 458 of 610
REJ09B0131-0600
Bit
15 to 10
9
8
7
6
5
4
3
2
1
0
Pin Function
General input
General output
Other functions
Bits 9 to 0 in PADRH
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 17.1.
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.