Datasheet

Section 9 I/O Ports
Rev.6.00 Mar. 18, 2009 Page 387 of 980
REJ09B0050-0600
9.12.4 Port E Pull-up Control Register (PEPCR)
PEPCR controls on/off states of the input pull-up MOS of port E. PEPCR is valid in 8-bit bus
mode.
Bit Bit Name Initial Value R/W Description
7 PE7PCR 0 R/W
6 PE6PCR 0 R/W
5 PE5PCR 0 R/W
4 PE4PCR 0 R/W
When PEDDR = 0 (input port), the input pull-up
MOS of the input pin is on when the corresponding
bit is set to 1.
3 PE3PCR 0 R/W
2 PE2PCR 0 R/W
1 PE1PCR 0 R/W
0 PE0PCR 0 R/W
9.12.5 Pin Functions
Port E pins also function as the pins for data I/Os. The correspondence between the register
specification and the pin functions is shown below.
• PE7/D7, PE6/D6, PE5/D5, PE4/D4, PE3/D3, PE2/D2, PE1/D1, PE0/D0
The pin function is switched as shown below according to the operating mode, bus mode, bit
EXPE, and bit PEDDR.
Operating
mode
1, 2, 4 7
Bus mode All areas
8-bit space
At least
one area
16-bit
space
— All areas
8-bit space
At least
one area
16-bit
space
EXPE — — 0 1 1
PEnDDR 0 1 — 0 1 0 1 —
Pin function PEn input PEn
output
Data I/O PEn input PEn
output
PEn input PEn
output
Data I/O
Legend: n = 7 to 0