Datasheet

Section 10 I/O Ports
R01UH0310EJ0500 Rev. 5.00 Page 621 of 1384
Sep 25, 2012
H8S/2426, H8S/2426R, H8S/2424 Group
• 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 the 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.
• PA1/A17/TxD4-B
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bit TE in SCR_4 of the SCI, bit A17E in PFCR1, bit TXD4S in PFCR4, and
bit PA1DDR.
Operating
mode
1, 2 4 3, 7
EXPE ⎯ ⎯ 0 1
A17E ⎯ 0 1 ⎯ 0 1
TE ⎯ 0 1 ⎯ 0 1 0 1 ⎯
PA1DDR ⎯ 0 1 ⎯ 0 1 0 1 ⎯ 0 1 ⎯ 0 1
Pin function A17
output
PA1
input
PA1
output
TxD4-B
output*
PA1
input
A17
output
PA1
input
PA1
output
TxD4-B
output*
PA1
input
PA1
output
TxD4-B
output*
PA1
input
A17
output
Note: * When using as TxD4-B output, set TXD4S in PFCR4 to 1 before other register setting.