HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 308

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 8 I/O Ports
8.11.2
Table 8.19 shows the port E register configuration.
Table 8.19 Port E Registers
Name
Port E data direction register
Port E data register
Port E register
Port E MOS pull-up control register
Note:
Port E Data Direction Register (PEDDR)
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.
This register is a write-only register, and cannot be written by bit manipulation instruction. For
details, see section 2.10.4, Access Methods for Registers with Write-Only Bits.
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.
Rev.3.00 Mar. 26, 2007 Page 266 of 772
REJ09B0355-0300
Bit
Initial value
R/W
Modes 1, 2, 4, 5, and 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.
Note: Modes 2 and 6 cannot be used in the H8S/2240.
* Lower 16 bits of the address.
Register Configuration
:
:
:
PE7DDR
W
7
0
PE6DDR
W
6
0
PE5DDR
PEDDR
PEDR
PEPCR
Abbreviation
PORTE
W
5
0
PE4DDR
W
4
0
PE3DDR
R/W
W
R/W
R
R/W
W
3
0
Initial Value
H'00
H'00
Undefined
H'00
PE2DDR
W
2
0
PE1DDR
W
1
0
H'FEBD
Address*
H'FF6D
H'FF5D
H'FF74
PE0DDR
W
0
0