SH7280 Datasheet, PDF (1346/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 24 I/O Ports
24.5.1 Register Descriptions
Port E is a 16-bit I/O port in SH7243, SH7285 and SH7286. Port E has the following registers. See
section 30, List of Registers for details on the register address and states in each operating mode.
Table 24.9 Register Configuration
Register Name
Abbreviation R/W Initial Value Address
Access Size
Port E data register L PEDRL
R/W H'0000
H'FFFE3A02 8, 16
Port E port register L PEPRL
R
—
H'FFFE3A1E 8, 16
24.5.2 Port E Data Register L (PEDRL)
PEDRL is a 16-bit readable/writable register that stores port E data. In SH7243, SH7285 and
SH7286, Bits PE15DR to PE0DR, correspond to pins PE15 to PE0 respectively (description of
multiplexed functions are abbreviated here).
When a pin function is general output, if a value is written to PEDRL, the value is output directly
from the pin, and if PEDRL is read, the register value is returned directly regardless of the pin
state.
When a pin function is general input, if PEDRL is read, the pin state, not the register value, is
returned directly. If a value is written to PEDRL, although that value is written into PEDRL, it
does not affect the pin state. Table 24.10 summarizes read/write operations of port E data register.
Bit: 15
PE15
DR
Initial value: 0
R/W: R/W
14
PE14
DR
0
R/W
13
PE13
DR
0
R/W
12
PE12
DR
0
R/W
11
PE11
DR
0
R/W
10
PE10
DR
0
R/W
9
PE9
DR
0
R/W
8
PE8
DR
0
R/W
7
PE7
DR
0
R/W
6
PE6
DR
0
R/W
5
PE5
DR
0
R/W
4
PE4
DR
0
R/W
3
PE3
DR
0
R/W
2
PE2
DR
0
R/W
1
PE1
DR
0
R/W
0
PE0
DR
0
R/W
Initial
Bit
Bit Name Value R/W Description
15
PE15DR 0
R/W See table 24.10.
14
PE14DR 0
R/W
13
PE13DR 0
R/W
12
PE12DR 0
R/W
Rev. 1.00 Jun. 26, 2008 Page 1316 of 1692
REJ09B0393-0100