HD64F2357F20V Datasheet, PDF (353/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

9.12.2 Register Configuration
Table 9-21 shows the port E register configuration.
Table 9-21 Port E Registers
Name
Abbreviation R/W
Port E data direction register
PEDDR
W
Port E data register
PEDR
R/W
Port E register
PORTE
R
Port E MOS pull-up control register*² PEPCR
R/W
Notes: 1. Lower 16 bits of the address.
2. PEPCR settings are prohibited in the ROMless version.
Initial Value
H'00
H'00
Undefined
H'00
Address*¹
H'FEBD
H'FF6D
H'FF5D
H'FF74
Port E Data Direction Register (PEDDR)
Bit
:
7
6
5
4
3
2
1
0
PE7DDR PE6DDR PE5DDR PE4DDR PE3DDR PE2DDR PE1DDR PE0DDR
Initial value :
0
0
0
0
0
0
0
0
R/W
:W
W
W
W
W
W
W
W
PEDDR is an 8-bit write-only register, the individual bits of which specify input or output for the pins of port E. PEDDR
cannot be read; if it is, an undefined value will be read.
PEDDR is initialized to H'00 by a power-on reset, and in hardware standby mode. It retains its prior state after a manual
reset*, and in software standby mode.
Note: * Manual reset is only supported in the H8S/2357 ZTAT.
• Mode 7*
Setting a PEDDR bit to 1 makes the corresponding port E pin an output port, while clearing the bit to 0 makes the pin
an input port.
Note: * Modes 6 and 7 are provided in the on-chip ROM version only.
• Modes 4 to 6*
When 8-bit bus mode has been selected, port E pins function as I/O ports. Setting a PEDDR bit to 1 makes the
corresponding port E pin an output port, while clearing the bit to 0 makes the pin an input port.
When 16-bit bus mode has been selected, the input/output direction specification by PEDDR is ignored, and port E is
designated for data I/O.
For details of 8-bit and 16-bit bus modes, see section 6, Bus Controller.
Port E Data Register (PEDR)
Bit
:
Initial value :
R/W
:
7
PE7DR
0
R/W
6
PE6DR
0
R/W
5
PE5DR
0
R/W
4
PE4DR
0
R/W
3
PE3DR
0
R/W
2
PE2DR
0
R/W
1
PE1DR
0
R/W
0
PE0DR
0
R/W
PEDR is an 8-bit readable/writable register that stores output data for the port E pins (PE₇ to PE₀).
Rev.6.00 Oct.28.2004 page 323 of 1016
REJ09B0138-0600H