upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 372

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

372
(2) When used as interrupt
<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 vectored interrupts are used).
Figure 21-5 shows the timing of the interrupt signal generated by the low-voltage detector. The numbers in
this timing chart correspond to <1> to <7> above.
When starting operation
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 21 LOW-VOLTAGE DETECTOR
DD
User’s Manual U16961EJ4V0UD
)
detection voltage (V
LVI
)” at bit 0 (LVIF) of LVIM.