r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 654

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 10 I/O Ports
10.13.6 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
Legend:
n = 7 to 0
10.13.7 Port E Input Pull-Up MOS States
Port E has a built-in input pull-up MOS function that can be controlled by software. This input
pull-up MOS function can be used in 8-bit bus mode. The input pull-up MOS can be specified as
on or off on a bit-by-bit basis. In 8-bit bus mode, when a PEDDR bit is cleared to 0, setting the
corresponding PEPCR bit to 1 turns on the input pull-up MOS for that pin.
Table 10.7 summarizes the input pull-up MOS states.
Table 10.7 Input Pull-Up MOS States for Port E
Legend:
Off:
On/Off: Input pull-up MOS is on when PEDDR = 0 and PEPCR = 1; otherwise off.
Rev. 1.00 Sep. 19, 2008 Page 624 of 1342
REJ09B0467-0100
Operating
mode
Bus mode
EXPE
PEnDDR
Pin function
Mode
1, 2, or 4
The pin function is switched as shown below according to the combination of the operating
mode, bus mode, bit EXPE, and bit PEnDDR.
Input pull-up MOS is always off.
8-bit bus
16-bit bus
input
All areas are
PEn
8-bit space
0

output
PEn
1
1, 2, 4
At least one
Reset
Off
area is 16-
bit space
Data I/O


Hardware
Standby Mode
Off
input
PEn
0

0
output
PEn
1
input
Software
Standby Mode
On/Off
Off
PEn
All areas are
0
8-bit space
7
1
output
PEn
1
At least one area
is 16-bit space
In Other
Operations
On/Off
Off
Data I/O

1