HD6475348R Datasheet, PDF (197/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

Table 9-17 shows how the functions of the pins of port 9 are selected.
Table 9-17 Port 9 Pin Functions
Pin
P97 /
SCK1
Selection of Pin Functions
The function depends on the communication mode bit (C/A) in the SCI1 serial mode
register (SMR) and the clock enable 1 and 0 bits (CKE1 and CKE0) in the SCI1
serial control register (SCR).
C/A
0
1
CKE1
0
1
0
1
CKE0
0
1
0
1
0
1
0
1
Pin function P97 SCI1 SCI1 external SCI1 internal SCI1 external
input/ internal clock input clock output clock input
output clock
output
When used for P97 input/output, the input or output function is selected by P97DDR.
P96 / RXD1 The function depends on the receive enable bit (RE) in the SCI1 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
RXD1 input
P95 / TXD1 The function depends on the transmit enable bit (TE) in SCI1’s SCR and on the
P96DDR bit as follows.
TE
P95DDR
Pin function
0
0
1
P95 input P95 output
1
0
1
TXD1 output
180