5.3 Pin Functions - Renesas H8S/2633 Series Hardware Manual

10A.5.3 Pin Functions
The pins of port 7 are multipurpose pins which function as 8-bit timer I/O pins, (TMRI01,
TMCI01, TMRI23, TMCI23, TMO0, TMO1, TMO2, and TMO3), DMAC I/O pins (DREQ0,
TEND0, DREQ1, and TEND1), bus control output pins (CS4 to CS7), IIC input pin (SYNCI), SCI
I/O pins (SCK3, RxD3, and TxD3) and manual reset input pin (MRES). Table 10A-8 shows the
functions of port 7 pins.
Table 10A-8 Port 7 Pin Functions
Pin Selection Method and Pin Functions
P77/TxD3 Switches as follows according to combinations of SCR TE bit of SCI3, and the
P77DDR bit.
TE
P77DDR
Pin function
P76/RxD3 Switches as follows according to combinations of SCR RE bit of SCI3 and the
P76DDR bit.
RE
P76DDR
Pin function
P75/TMO3/ Switches as follows according to combinations of SMR C/A bit of SCI3, SCR CKE0
SCK3 and CKE1 bits, TCSR3 OS3 to OS0 bits of the 8-bit timer, and the P75DDR bit.
OS3 to OS0
CKE1
C/A
CKE0
P75DDR
Pin function
392
0
0
P77 input pin P77 output pin
0
0
P76 input pin P76 output pin
0
0
0
0 1
P75 P75
input pin output pin
1
TxD3 output pin
1
All 0
1
1 —
— —
SCK3 SCK3
output pin output pin
1
—
1
—
RxD3 I/O pin
Any is 1
1 —
— —
— —
— —
SCK3 TMO3
input pin output