Datasheet

Section 10 I/O Ports
Page 650 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
10.13.6 Pin Functions
Port E pins also function as the pins for data I/Os and address outputs. The correspondence
between the register specification and the pin functions is shown below.
• PE7/D7/AD7, PE6/D6/AD6, PE5/D5/AD5, PE4/D4/AD4, PE3/D3/AD3, PE2/D2/AD2,
PE1/D1/AD1, PE0/D0/AD0
The pin function is switched as shown below according to the combination of the operating
mode, bus mode, bit EXPE, bit MPXE in MPXCR of the bus controller, and bit PEnDDR.
Operating
mode
1, 2, 4 3, 7
Bus mode All areas are
8-bit space
At least one
area is 16-bit
space
⎯ All areas are
8-bit space
At least one area
is 16-bit space
EXPE ⎯ ⎯ 0 1 1
MPXE ⎯ 0 1 ⎯ ⎯ 0 1
PEnDDR 0 1 ⎯ 0 1 0 1 ⎯
Pin function PEn
input
PEn
output
Data
I/O
Address
output/
data I/O
PEn
input
PEn
output
PEn
input
PEn
output
Data
I/O
Address
output/
data I/O
[Legend]
n = 7 to 0