5.3 Pin Functions - Renesas H8S/2633 Series Hardware Manual

10B.5.3 Pin Functions
The pins of port 7 are multipurpose pins which function as bus control output pins (CS4 to CS7),
SCI I/O pins (SCK3, RxD3, and TxD3), and manual reset input pin (MRES). Table 10B-8 shows
the functions of port 7 pins.
Table 10B-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/SCK3 Switches as follows according to combinations of SMR C/A bit of SCI3, SCR CKE0
and CKE1 bits, and the P75DDR bit.
CKE1
C/A
CKE0
P75DDR
Pin function
P74/MRES Switches as follows according to combinations of SYSCR MRESE bit and the
P74DDR bit.
MRESE
P74DDR
Pin function
468
0
0
P77 input pin P77 output pin
0
0
P76 input pin P76 output pin
0
0
0 1
P75 P75
input pin output pin
0
0
P74 input pin
1
TxD3 output pin
1
RxD3 I/O pin
0
1
—
SCK3 SCK3
output pin output pin
1
P74 output pin
1
—
1
—
1
1 —
— —
— —
SCK3
input pin
1
—
MRES input pin