HD6417606 RENESAS [Renesas Technology Corp], HD6417606 Datasheet - Page 399

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

15.5.1
Port E is a 25-bit I/O port that has the following registers. For details on the addresses of these
registers and the states of these registers in each processing state, see section 18, List of Registers.
• Port E data register H (PEDRH)
• Port E data register L (PEDRL)
15.5.2
PEDRH and PEDRL are 16-bit readable/writable registers that store data for port E. Bits PE24DR
to PE0DR correspond to pins PE24 to PE00. (Description of multiplexed functions is omitted.)
When the pin function is general output port, if the value is written to PEDRH or PEDRL, the
value is output from the pin; if PEDRH or PEDRL 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
PEDRH or PEDRL is read. Data can be written to PEDRH or PEDRL but no effect on the pin
state. Table 15.5 shows the reading/writing function of the port E data registers H and L.
• PEDRH
Bit
15 to 9 
8
7
6
5
4
3
2
1
0
Bit Name
PE24DR
PE23DR
PE22DR
PE21DR
PE20DR
PE19DR
PE18DR
PE17DR
PE16DR
Register Description
Port E Data Registers H and L (PEDRH and PEDRL)
Initial
Value
All 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
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
See table 15.5.
Rev. 4.00 Sep. 13, 2007 Page 373 of 502
Section 15 I/O Ports
REJ09B0239-0400