Control Of I/O Port - Epson E0C6001 Technical Manual

Control of I/O port

Table 4.5.1 I/O port control bits
Address
D3
P03
0F6H
0
0FCH
P00–P03
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Port)
Table 4.5.1 lists the I/O port control bits and their ad-
dresses.
Register
D2 D1 D0 Name
P02 P01 P00 P03
P02
R/W
P01
P00
0 0 IOC 0
0
R R/W
0
IOC
I/O port data (0F6H)
I/O port data can be read and output data can be written
through the port.
• When writing data
When 1 is written: High level
When 0 is written: Low level
When an I/O port is set to the output mode, the written
data is output from the I/O port pin unchanged. When 1
is written as the port data, the port pin goes high (V
and when 0 is written, the level goes low (V
can also be written in the input mode.
• When reading data
When 1 is read:
When 0 is read:
SR 1 0
– High Low
High Low
–
I/O port (P00–P03)
– High Low
High Low
–
0 Output Input
I/O port P00–P03 Input/Output
High level
Low level
Comment
),
DD
). Port data
SS
I-33