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Section 8 I/O Ports
8.1.14
Port E
Port E is an 8-bit I/O port. Port E pins can also function as the LPC input/output pins. Port E has
the following registers.
• Port E data direction register (PEDDR)
• Port E output data register (PEODR)
• Port E input data register (PEPIN)
(1)
Port E Data Direction Register (PEDDR)
The individual bits of PEDDR specify input or output for the port E pins.
Bit
Bit Name
7
PE7DDR
6
PE6DDR
5
PE5DDR
4
PE4DDR
3
PE3DDR
2
PE2DDR
1
PE1DDR
0
PE0DDR
(2)
Port E Output Data Register (PEODR)
PEODR stores output data for the port E pins.
Bit
Bit Name
7
PE7ODR
6
PE6ODR
5
PE5ODR
4
PE4ODR
3
PE3ODR
2
PE2ODR
1
PE1ODR
0
PE0ODR
Rev. 1.00 Mar. 12, 2008 Page 262 of 1178
REJ09B0403-0100
Initial Value
R/W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
Initial Value
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
0
R/W
Description
When set to 1, the corresponding pins function as
output port pins; when cleared to 0, function as input
port pins.
Since this register is allocated to the same address as
PEPIN, states of the port E pins are returned when
this register is read.
Description
The PEODR register stores the output data for the
pins that are used as the general output port.
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