Datasheet

Section 10 I/O Ports
R01UH0309EJ0500 Rev. 5.00 Page 615 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
Operating
mode
3, 7
EXPE 0 1
A19E ⎯ 0 1
CKE1 0 1 0 1 ⎯
C/A 0 1 ⎯ 0 1 ⎯ ⎯
CKE0 0 1 ⎯ ⎯ 0 1 ⎯ ⎯ ⎯
PA3DDR 0 1 ⎯ ⎯ ⎯ 0 1 ⎯ ⎯ ⎯ 0 1
Pin
function
PA3
input
PA3
output
SCK4-B
output*
SCK4-B
output*
SCK4-B
input*
PA3
input
PA3
output
SCK4-B
output*
SCK4-B
output*
SCK4-B
input*
PA3
input
A19
output
Note: * When using as SCK4-B input/output, set SCK4S in PFCR4 to 1 before other register
setting.
• PA2/A18/RxD4-B
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bit RE in SCR_4 of SCI, bit A18E in PFCR1, bit RXD4S in PFCR4, and bit
PA2DDR.
Operating
mode
1, 2 4 3, 7
EXPE ⎯ ⎯ 0 1
A18E ⎯ 0 1 ⎯ 0 1
RE ⎯ 0 1 ⎯ 0 1 0 1 ⎯
PA2DDR ⎯ 0 1 ⎯ 0 1 0 1 ⎯ 0 1 ⎯ 0 1
Pin function A18
output
PA2
input
PA2
output
RxD4-B
input*
PA2
input
A18
output
PA2
input
PA2
output
RxD4-B
input*
PA2
input
PA2
output
RxD4-B
input*
PA2
input
A18
output
Note: * When using as RxD4-B input, set RXD4S in PFCR4 to 1 before other register setting.