Port 4 Register (Pdr4); Table 4.6-3 Port 4 Register Function - Fujitsu F2MC-8L Series Hardware Manual

CHAPTER 4 I/O PORTS
4.6.1

Port 4 Register (PDR4)

This section describes the port 4 register.
Port 4 Register Functions
Port 4 data register (PDR4)
The PDR4 register holds the output latch state. The pin state cannot therefore be read from this
register.
Table 4.6-3 lists the functions of the port 4 register.

Table 4.6-3 Port 4 Register Function

Register Data
0
Port 4 data
register
(PDR4)
1
R/W:
*:
126
Read
Outputs an "L" level to
The output the pin.
latch value is (Sets "0" to the output
"0". latch and turn the output
transistor "ON".)
Sets the pin to the high-
The output impedance state.*
latch value is (Sets "1" to the output
"1". latch and turn the output
transistor "OFF".)
Readable and writable
Pins with a pull-up resistor (mask option) go to the pull-up state.
Write Read/Write
R/W
Address Initial value
000E 11111111
H B