HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 197

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Table 9-17 shows how the functions of the pins of port 9 are selected.
Table 9-17 Port 9 Pin Functions
Pin
P9
SCK
P9
P9
7
6
5
/
/ RXD
/ TXD
1
1
1
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
CKE1
CKE0
Pin function P9
When used for P9
The function depends on the receive enable bit (RE) in the SCI1 serial control
register (SCR) and on the P9
RE
P9
Pin function
The function depends on the transmit enable bit (TE) in SCI1’s SCR and on the
P9
TE
P9
Pin function
6
6
5
DDR
DDR bit as follows.
DDR
input/
output clock
P9
P9
7
0
7
6
5
0
0
input/output, the input or output function is selected by P9
input
input
0
SCI1
internal clock input
output
1
0
0
0
P9
P9
6
SCI1 external
DDR bit as follows.
6
5
0
output
output
180
1
1
1
1
SCI1 internal
clock output
0
0
TXD
0
RXD
0
1
1
1
1
output
input
1
1
1
1
SCI1 external
clock input
0
1
1
7
DDR.