8 SUPPLY VOLTAGE DETECTOR (SVD)
S1C17F13 TeChniCal Manual
Seiko epson Corporation
8-1
(Rev. 1.0)
Supply Voltage Detector (SVD)
8
Overview
8.1
SVD is a supply voltage detector to monitor the power supply voltage on the V
DD
pin or the voltage applied to an
external pin. The main features are listed below.
• Power supply voltage to be detected: Selectable from V
DD
and an external power supply (EXSVD)
• Detectable voltage level:
Selectable from among 19 levels (1.8 to 3.6 V)
• Detection results:
- Can be read whether the power supply voltage is lower than the detection
voltage level or not.
- Can generate an interrupt or a reset when low power supply voltage is de-
tected.
• Interrupt:
1 system (Low power supply voltage detection interrupt)
• Supports intermittent operations:
- Three detection cycles are selectable.
- Low power supply voltage detection count function to generate an inter-
rupt/reset when low power supply voltage is successively detected the
number of times specified.
- Continuous operation is also possible.
Figure 8.1.1 shows the configuration of SVD.
SVD
To system reset circuit
To interrupt controller
SVDMD[1:0]
Sampling timing
generator
Voltage
comparator
circuit
Interrupt/reset
control circuit
Detection
result counter
MODEN
SVDC[4:0]
VDSEL
SVDSC[1:0]
SVDIE
SVDIF
SVDDT
SVDRE[3:0]
CLKSRC[1:0]
CLKDIV[2:0]
Clock generator
CLK_SVD
V
DD
EXSVD
DBRUN
Inter
nal data
bu
s
1.1 SVD Configuration
Figure 8.