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SH7014 Datasheet(PDF) 519 Page - Renesas Technology Corp

Part # SH7014
Description  32-Bit RISC Microcomputer
PDF  754 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7014 Datasheet(HTML) 519 Page - Renesas Technology Corp

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17. I/O Ports (I/O)
Rev.5.00 Sep. 27, 2007 Page 485 of 716
REJ09B0398-0500
17.6.2
Port E Data Register (PEDR)
Bit:
15
14
13
12
11
10
9
8
PE15DR PE14DR PE13DR PE12DR PE11DR PE10DR PE9DR
PE8DR
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit:
7
6
5
4
3
2
1
0
PE7DR
PE6DR
PE5DR
PE4DR
PE3DR
PE2DR
PE1DR
PE0DR
Initial value:
0
0
0
0
0
0
0
0
R/W:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PEDR is a 16-bit read/write register that stores data for port E. The bits PE15DR to PE0DR
correspond to the PE15/DACK1 to PE0/TIOC0A/
DREQ0 pins. When the pins are used as
ordinary outputs, they will output whatever value is written in the PEDR; when PEDR is read, the
register value will be read regardless of the pin status. When the pins are used as ordinary inputs,
the pin status rather than the register value is read directly when PEDR is read. When a value is
written to PEDR, that value can be written into PEDR, but it will not affect the pin status. Table
17.15 shows the read/write operations of the port E data register.
PEDR is initialized by a external power-on reset. However, PEDR is not initialized for a reset by
WDT, standby mode, or sleep mode, so the previous data is retained.
Table 17.15 Read/Write Operation of the Port E Data Register (PEDR)
PEIOR
Pin Status
Read
Write
0
Ordinary input
Pin status
Can write to PEDR, but it has no effect on pin status
Other function
Pin status
Can write to PEDR, but it has no effect on pin status
1
Ordinary output
PEDR value
Value written is output by pin
Other function
PEDR value
Can write to PEDR, but it has no effect on pin status



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