Datasheet

Section 10 I/O Ports
Page 616 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
• 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 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.
• PA0/A16
The pin function is switched as shown below according to the combination of the operating
mode, bit EXPE, bit A16E in PFCR1, and bit PA0DDR.
Operating mode 1, 2 4 3, 7
EXPE ⎯ ⎯ 0 1
A16E ⎯ 0 1 ⎯ 0 1
PA0DDR ⎯ 0 1 0 1 0 1 0 1 0 1
Pin function A16
output
PA0
input
PA0
output
PA0
input
A16
output
PA0
input
PA0
output
PA0
input
PA0
output
PA0
input
A16
output