upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 187

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(4) Power-fail comparison mode register (PFM)
(5) Power-fail comparison threshold register (PFT)
The power-fail comparison mode register (PFM) is used to compare the A/D conversion result (value of the
ADCR register) and the value of the power-fail comparison threshold value register (PFT).
PFM can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
Caution If data is written to PFM, a wait cycle is generated. For details, see CHAPTER 27 CAUTIONS
The power-fail comparison threshold register (PFT) is a register that sets the threshold value when comparing the
values with the A/D conversion result.
8-bit data in PFT is compared to the higher 8 bits (FF09H) of the 10-bit A/D conversion result.
PFT can be set by an 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
Caution If data is written to PFT, a wait cycle is generated. For details, see CHAPTER 27 CAUTIONS
FOR WAIT.
FOR WAIT.
Figure 10-8. Format of Power-Fail Comparison Threshold Register (PFT)
Address: FF2AH
Symbol
Address: FF2BH
Symbol
Figure 10-7. Format of Power-Fail Comparison Mode Register (PFM)
PFM
PFT
PFEN
PFEN
PFT7
<7>
0
1
0
1
7
Stops power-fail comparison (used as a normal A/D converter)
Enables power-fail comparison (used for power-fail detection)
Higher 8 bits of
ADCR ≥ PFT
Higher 8 bits of
ADCR < PFT
Higher 8 bits of
ADCR ≥ PFT
Higher 8 bits of
ADCR < PFT
PFCM
PFCM
After reset: 00H
After reset: 00H
PFT6
<6>
6
CHAPTER 10 A/D CONVERTER
User’s Manual U16846EJ3V0UD
PFT5
5
0
5
Power-fail comparison enable
Interrupt request signal (INTAD) generation
No INTAD generation
No INTAD generation
INTAD generation
PFT4
R/W
R/W
4
0
4
Power-fail comparison mode selection
PFT3
3
0
3
PFT2
2
0
2
PFT1
1
0
1
PFT0
0
0
0
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