
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
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(2) Registers
(a) Port register CT (PCT)
Port register PCT (PCT) is an 8-bit register that controls reading the pin level and writing the output level.
This register can be read or written in 8-bit or 1-bit units.
PCT7
Outputs 0.
Outputs 1.
PCTn
0
1
Controls output data (in output mode) (V850ES/SA2: n = 0, 1, 4 to 7, V850ES/SA3: n = 0 to 7)
PCT
PCT6
PCT5
PCT4
PCT3Note PCT2Note
PCT1
PCT0
After reset: Undefined
R/W
Address: FFFFF00AH
Note
Bits 3 and 2 are provided in the V850ES/SA3 only. Be sure to clear these bits to 0 in the V850ES/SA2.
Remarks 1. In input mode:
When port CT (PCT) is read, the pin level at that time is read. When written, the
data written to PCT is written. The input pin is not affected.
In output mode: When port CT (PCT) is read, the value of PCT is read. When a value is written
to PCT, it is immediately output.
2. After reset, an undefined value (pin input level) is read from PCT in the input mode. When PCT is
read in the output mode, 00H (value of the output latch) is read.
(b) Port mode register CT (PMCT)
This is an 8-bit register that specifies the input or output mode.
This register can be read or written in 8-bit or 1-bit units.
PMCT7
Output mode
Input mode
PMCTn
0
1
Controls input/output mode (V850ES/SA2: n = 0, 1, 4 to 7, V850ES/SA3: n = 0 to 7)
PMCT
PMCT6
PMCT5
PMCT4 PMCT3Note PMCT2Note PMCT1
PMCT0
After reset: FFH
R/W
Address: FFFFF02AH
Note
Bits 3 and 2 are provided in the V850ES/SA3 only. Be sure to set these bits to 1 in the V850ES/SA2.