HD6437101 RENESAS [Renesas Technology Corp], HD6437101 Datasheet - Page 472

• Manufacturer Part Number: HD6437101
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 15 I/O Ports
15.4.2
PEDRH and PEDRL are 16-bit readable/writable registers that store port E data. Bits PE21DR to
PE0DR correspond to pins PE21 to PE0 (multiplexed functions omitted here).
When a pin functions is a general output, if a value is written to PEDRH or PEDRL, that value is
output directly from the pin, and if PEDRH or PEDRL is read, the register value is returned
directly regardless of the pin state.
When a pin functions is a general input, if PEDRH or PEDRL is read, the pin state, not the register
value, is returned directly. If a value is written to PEDRH or PEDRL, although that value is
written into PEDRH or PEDRL it does not affect the pin state. Table 15.4 summarizes port E data
register read/write operations.
• PEDRH
Bit
15 to 6 —
5
4
3
2
1
0
Rev.1.00 Sep. 18, 2008 Page 438 of 522
REJ09B0069-0100
Bit Name
PE21DR
PE20DR
PE19DR
PE18DR
PE17DR
PE16DR
Port E Data Registers H and L (PEDRH and PEDRL)
Initial Value
All 0
0
0
0
0
0
0
R/W
R
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 15.4.