HD6475328-CP10 Datasheet, PDF (192/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

Table 9-16 shows how the functions of the pins of port 9 are selected.
Table 9-16 Port 9 Pin Functions
Pin
P97 /
SCK
Selection of Pin Functions
The function depends on the communication mode bit (C/A) and the clock enable 1
and 2 bits (CKE1 and CKE0) of the serial control register (SCR) of the serial
communication interface as follows:
C/A
0
CKE1
0
1
0
CKE0
0
1
0
1
0
1
Pin function P97 SCI SCI external SCI internal
input internal clock input clock output
or
clock
output* output
* Input or output is selected by the P97DDR bit.
1
1
0
1
SCI external
clock input
P96 / RXD
The function depends on the receive enable bit (RE) of the serial control register
(SCR) and on the P96DDR bit as follows:
RE
P96DDR
Pin function
0
0
1
P96 input P96 output
1
0
1
RXD input
P95 / TXD
The function depends on the transmit enable bit (TE) of the serial control register
(SCR) and on the P95DDR bit as follows:
TE
P95DDR
Pin function
0
0
1
P95 input P95 output
1
0
1
TXD output
175