Renesas H8/38024 Series, Руководство по оборудованию

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Rev. 6.00, 08/04, page 432 of 628
14.3.2 Low-Voltage Detection Circuit
LVDR (Reset by Low Voltage Detect) Circuit:
Figure 14.3 shows the timing of the LVDR function. The LVDR enters the module-standby state
after a power-on reset is canceled. To operate the LVDR, set the LVDE bit in LVDCR to 1, wait
for 150
µ
s (t
LVDON
) until the reference voltage and the low-voltage-detection power supply have
stabilized, based on overflow of LVDNT, etc., then set the LVDRE bit in LVDCR to 1. After that,
the output settings of ports must be made. To cancel the low-voltage detection circuit, first the
LVDRE bit should be cleared to 0 and then the LVDE bit should be cleared to 0. The LVDE and
LVDRE bits must not be cleared to 0 simultaneously because incorrect operation may occur.
When the power-supply voltage falls below the Vreset voltage (typ. = 2.3 V or 3.3 V), the LVDR
clears the
LVDRES
signal to 0, and resets the prescaler S. The low-voltage detection reset state
remains in place until a power-on reset is generated. When the power-supply voltage rises above
the Vreset voltage again, the prescaler S starts counting. It counts 131,072 clock (
φ
) cycles, and
then releases the internal reset signal. In this case, the LVDE, LVDSEL, and LVDRE bits in
LVDCR are not initialized.
Note that if the power supply voltage (Vcc) falls below V
LVDRmin
= 1.0 V and then rises from that
point, the low-voltage detection reset may not occur.
If the power supply voltage (Vcc) falls below Vpor = 100 mV, a power-on reset occurs.
LVDRES
V
CC
Vreset
V
SS
V
LVDRmin
OVF
PSS-reset
signal
Internal reset
signal
131,072 cycles
PSS counter starts Reset released
Figure 14.3 Operational Timing of LVDR Circuit