upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 377

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) When used as interrupt
Figure 22-5 shows the timing of the internal reset signal generated by the low-voltage detector. The numbers in
this timing chart correspond to <1> to <7> above.
• When starting operation
<1> Mask the LVI interrupt (LVIMK = 1).
<2> Set the detection voltage using bits 3 to 0 (LVIS3 to LVIS0) of the low-voltage detection level selection
<3> Set bit 7 (LVION) of LVIM to 1 (enables LVI operation).
<4> Use software to instigate a wait of at least 0.2 ms.
<5> Confirm that “supply voltage (V
<6> Clear the interrupt request flag of LVI (LVIIF) to 0.
<7> Release the interrupt mask flag of LVI (LVIMK).
<8> Execute the EI instruction (when vector interrupts are used).
• When stopping operation
Either of the following procedures must be executed.
•
•
When using 8-bit memory manipulation instruction:
When using 1-bit memory manipulation instruction:
register (LVIS).
Write 00H to LVIM.
Clear LVION to 0.
CHAPTER 22 LOW-VOLTAGE DETECTOR
DD
User’s Manual U16962EJ3V0UD
) ≥ detection voltage (V
LVI
)” with bit 0 (LVIF) of LVIM.
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