Datasheet

Section 10 I/O Ports
Rev. 6.00 Mar. 18, 2010 Page 324 of 982
REJ09B0054-0600
10.4.4 Pin Functions
Port 7 pins also function as TMR I/O pins (TMR_0, TMR_1, TMR_2*
1
, and TMR_3*
1
), bus
control output pin, SCI I/O pins, and DMAC*
2
I/O pins. Values of the register and pin functions
are shown below.
Notes: 1. Not available in the H8S/2237 Group and H8S/2227 Group.
2. Supported only by the H8S/2239 Group.
• P77/TxD3
The pin functions are switched as shown below according to the combination of the TE bit in
SCR_3 of SCI_3 and the P77DDR bit.
TE 0 1
P77DDR 0 1 ⎯
Pin functions P77 input pin P77 output pin TxD3 output
• P76/RxD3
The pin functions are switched as shown below according to the combination of the RE bit in
SCR_3 of SCI_3 and the P76DDR bit.
RE 0 1
P76DDR 0 1 ⎯
Pin functions P76 input pin P76 output pin RxD3 Input
• P75/TMO3/SCK3
The pin functions are switched as shown below according to the combination of OS3 to OS0
bits in TCSR_3 of TMR_3*, CKE1 and CKE0 bits in SCR_3 of SCI_3, the C/A bit in SMR_3,
and the P75DDR bit.
OS3 to OS0
*
All bits are 0 Any bit is 1
CKE1 0 1 ⎯
C/A 0 1 ⎯ ⎯
CKE0 0 1 ⎯ ⎯ ⎯
P75DDR 0 1 ⎯ ⎯ ⎯ ⎯
Pin functions P75 input
pin
P75 output
pin
SCK3 output
pin
SCK3 output
pin
SCK3 input
pin
TMO3
*
output pin
Note: * Not available in the H8S/2237 Group and H8S/2227 Group.