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Rev. 1.0, 07/01, page 271 of 372
V
CC
Vint(D)
Vint(U)
V
SS
LVDDF
LVDUE
LVDUF
IRQ0 interrupt generated IRQ0 interrupt generated
LVDDE
Figure 17-4 Operational Timing of LVDI
Procedures for Operating and Releasing the Low-Voltage Detection Circuit :
To operate or release the low-voltage detection circuit normally, follow the procedure described
below. Figure 17-5 shows the timing for the operation and release of the low-voltage detection
circuit.
1. To operate the low-voltage detection circuit, set LVDE in LVDCR to 1.
2. Wait for tLVDON (10 µs) until the reference voltage and the low-voltage-detection power
supply have stabilized. Then, set LVDRE, LVDDE, or LVDUE in LVDCR to 1, as required.
3. To release the low-voltage detection circuit, start by clearing all of LVDRE, LVDDE, and
LVDUE in LVDCR to 0. Wait for tLDOFF (one instruction-execution period), and then clear
LVDE in LVDCR to 0.