HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 190

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

9.10 Port 9
9.10.1 Overview
Port 9 is an 8-bit input/output port with the pin configuration shown in figure 9-21. In addition to
general-purpose input and output, its pins are used for the output compare A signals from free-
running timers 2 and 3, for PWM timer output, and for input and output by the on-chip serial
communication interface 9 (SCI). The pin functions are the same in all MCU operating modes.
Outputs from port 9 can drive one TTL load and a 30pF capacitive load. They can also drive a
Darlington transistor pair.
9.10.2 Port 9 Registers
Register Configuration: Table 9-15 lists the registers of port 9.
Table 9-15 Port 9 Registers
Name
Port 9 data direction register
Port 9 data register
Port
9
Figure 9-21 Pin Functions of Port 9
Abbreviation
P9DDR
P9DR
P9
P9
P9
P9
P9
P9
P9
P9
7
6
5
4
3
2
1
0
(input/output) / SCK (input/output)
(input/output) / RXD (input)
(input/output) / TXD (output)
(input/output) / PW
(input/output) / PW
(input/output) / PW
(input/output) / FTOA
(input/output) / FTOA
173
Read/Write
W
R/W
3
2
1
(output)
(output)
(output)
3
2
(output)
(output)
Initial Value
H'00
H'00
Address
H'FFFE
H'FFFF