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CHAPTER 13 A/D CONVERTER
(3) Power-fail compare mode register (PFM)
The power-fail compare mode register (PFM) controls a comparison operation.
RESET input clears PFM to 00H.
Figure 13-5. Power-Fail Compare Mode Register (PFM) Format
Address: FF82H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
PFM
PFEN
PFCM
0
0
0
0
0
0
PFEN
Enables Power-Fail Comparison
0
Disables power-fail comparison (used as normal A/D converter)
1
Enables power-fail comparison (used to detect power failure)
PFCM
Power-Fail Compare Mode Selection
0
ADCR1
≥
PFT
Generates interrupt request signal INTAD
ADCR1 < PFT
Does not generate interrupt request signal INTAD
1
ADCR1
≥
PFT
Does not generate interrupt request signal INTAD
ADCR1 < PFT
Generates interrupt request signal INTAD
Caution
Bits 0 to 5 must be set to 0.
(4) Power-fail compare threshold value register (PFT)
The power-fail compare threshold value register (PFT) sets a threshold value against which the result of A/D
conversion is to be compared.
PFT is set with an 8-bit memory manipulation instruction.
RESET input clears PFT to 00H.
Содержание mPD780973 Series
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