
159
Chapter 4
Port Functions
User’s Manual U16702EE3V2UD00
4.3.11 Port
CS
Port CS is a 2-bit port for which I/O settings can be controlled in 1-bit units.
(1)
Port CS functions
•
2-bit I/O port
•
Port input/output specifiable in 1-bit units by port mode register CS (PMCS)
•
Port mode/control mode specifiable in 1-bit units by port mode control register CS (PMCCS)
•
On-chip pull-up resistor specifiable in 1-bit units by pull-up resistor option register CS (PUCS)
•
On-chip pull-down resistor specifiable in 1-bit units by pull-down resistor option register CS
(PDCS)
See
Table 4-8, “Port Type,” on page 170
for alternate functions.
(2)
Registers
(a) Port register CS (PCS)
Port register CS (PCS) is an 8-bit register that controls pin level read, output level write. It can be
read and written in 8-bit or 1-bit units.
Figure 4-56:
Port Register CS (PCS) Format
Note:
PCS7 to PCS2: please set 0 any time.
Remarks: 1.
Input mode:
When port CS (PCS) is read, the pin levels at this time are read. During
write, the data written to PCS is written. This does not affect the input
pins.
Output mode:
When port CS (PCS) is read, the value of PCS is read. During write,
the value is written to PCS and the written value is immediately output.
2.
An undefined value (pin input level) is read for the value after reset when PCS is read in
the input mode. When PCS is read in the output mode, 00H (output latch value) is out-
put.
Symbol
7
6
5
4
3
2
1
0
Address
After reset
PCS
0
Note
0
Note
0
Note
0
Note
0
Note
0
Note
PCS1
PCS0
FFFFF008H undefined
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PCSn
Output data control (in output mode) (n = 0, 1)
0
Outputs 0
1
Outputs 1
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