HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 192

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

Table 9-16 shows how the functions of the pins of port 9 are selected.
Table 9-16 Port 9 Pin Functions
Pin
P9
SCK
P9
P9
7
6
5
/
/ RXD
/ TXD
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
CKE1
CKE0
Pin function P9
* Input or output is selected by the P9
The function depends on the receive enable bit (RE) of the serial control register
(SCR) and on the P9
RE
P9
Pin function
The function depends on the transmit enable bit (TE) of the serial control register
(SCR) and on the P9
TE
P9
Pin function
6
5
DDR
DDR
input
or
output* output
P9
P9
7
0
6
5
0
0
input
input
0
6
5
SCI
internal clock input
clock
DDR bit as follows:
DDR bit as follows:
1
0
0
0
P9
P9
SCI external
6
5
0
output
output
175
1
1
1
7
DDR bit.
1
SCI internal
clock output
0
0
0
TXD output
RXD input
0
1
1
1
1
1
1
SCI external
clock input
0
1
1