HD64F3687GHV Datasheet, PDF (415/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 19 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
External
power
supply
RES
CRES
150 kΩ
Noise filter
circuit
Noise filter
circuit
Vcc
Ladder
network
Vreset
VintU
VintD
LVDRES
φ _CK
OVF
R ^PSS
R
Q
S
Internal
reset signal
Power-on reset circuit
LVDCR
ExtD
ExtU
LVDINT
Interrupt
control
circuit
VDDII
VBGR
[Legend]
PSS:
LVDCR:
LVDSR:
VBGR:
ExtD:
ExtU:
VDDII:
Prescaler S
Low-voltage-detection control register
Low-voltage-detection status register
Reference voltage from BGR
Compared voltage for falling external input voltage
Compared voltage for rising external input voltage
Bit 5 in LVDCR
LVDSR
Interrupt request
Figure 19.2 Block Diagram of Power-On Reset Circuit and Low-Voltage Detection Circuit
Rev. 3.00 Sep. 10, 2007 Page 381 of 528
REJ09B0216-0300