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CHAPTER 4 PORT FUNCTIONS
User’s Manual U15905EJ2V1UD
163
(2) Registers
(a) Port register DH (PDH)
Port register PDH (PDH) 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.
Outputs 0.
Outputs 1.
PDHn
0
1
Controls output data (in output mode) (V850ES/SA2: n = 0 to 5, V850ES/SA3: n = 0 to 7)
PDH
After reset: Undefined
R/W
Address: FFFFF006H
PDH7Note PDH6Note
PDH5
PDH4
PDH3
PDH2
PDH1
PDH0
Note
Bits 7 and 6 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 DH (PDH) is read, the pin level at that time is read. When written, the
data written to PDH is written. The input pin is not affected.
In output mode: When port DH (PDH) is read, the value of PDH is read. When a value is written
to PDH, it is immediately output.
2. After reset, an undefined value (pin input level) is read from PDH in the input mode. When PDH is
read in the output mode, 00H (value of the output latch) is read.
(b) Port mode register DH (PMDH)
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.
PMDH7Note
Output mode
Input mode
PMDHn
0
1
Controls input/output mode (V850ES/SA2: n = 0 to 5, V850ES/SA3: n = 0 to 7)
PMDH6Note
PMDH5
PMDH4
PMDH3
PMDH2
PMDH1
PMDH0
After reset: FFH
R/W
Address: FFFFF026H
PMDH
Note
Bits 7 and 6 are provided in the V850ES/SA3 only. Be sure to set these bits to 1 in the V850ES/SA2.
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