
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
147
(2) Registers
(a) Port register CM (PCM)
Port register PCM (PCM) 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.
0
Outputs 0.
Outputs 1.
PCMn
0
1
Controls output data (in output mode) (V850ES/SA2: n = 0 to 3, V850ES/SA3: n = 0 to 5)
PCM
0
PCM5Note PCM4Note
PCM3
PCM2
PCM1
PCM0
After reset: Undefined
R/W
Address: FFFFF00CH
Note
Bits 5 and 4 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 CM (PCM) is read, the pin level at that time is read. When written, the
data written to PCM is written. The input pin is not affected.
In output mode: When port CM (PCM) is read, the value of PCM is read. When a value is written
to PCM, it is immediately output.
2. After reset, an undefined value (pin input level) is read from PCM in the input mode. When PCM
is read in the output mode, 00H (value of the output latch) is read.
(b) Port mode register CM (PMCM)
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.
1
Output mode
Input mode
PMCMn
0
1
Controls input/output mode (V850ES/SA2: n = 0 to 3, V850ES/SA3: n = 0 to 5)
PMCM
1
PMCM5Note PMCM4Note PMCM3
PMCM2
PMCM1
PMCM0
After reset: FFH
R/W
Address: FFFFF02CH
Note
Bits 5 and 4 are provided in the V850ES/SA3 only. Be sure to set these bits to 1 in the V850ES/SA2.