Port 9; Table 8-35 Pins Of Port 9 - Fujitsu MB90420/5 (A) Series Hardware Manual

MB90420/5 (A) SERIES F

8.11 Port 9

Port 9 is a general-purpose I/O port that serves both as a resource input and output. Each pin can be
switched between the resource and the port by the bit. The function as a general-purpose I/O port is mainly
explained here. The configuration, pins, block diagram of the pins, and registers for port 9 are shown below.
n Configuration of port 9
Port 9 consists of the following three elements.
• General-purpose I/O pins, resource I/O pin (P90/SEG22 to P91/SEG23)
• Port 9 data register (PDR9)
• Port 9 direction register (DDR9)
n Pins of port 9
The I/O pins of the port 9 also serve as resource I/O pins, so when using a pin of port 9 as a resource I/O
pin, it cannot be used as a general-purpose I/O port.
Table 8-35 shows the pins of port 9.
Port Name Pin Name
P90/SEG22
P91/SEG23
Port 9
For the circuit type, see Section 1.7.
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL

Table 8-35 Pins of Port 9

Port Function
General-
P90 SEG22
purpose
P91 SEG23
I/O
8-46
Resource
Input
LCD CMOS
controller (hysteresis)
I/O Type
Circuit Type
Output
CMOS E