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10 Supply Voltage Detector (SVD)
10.1 Overview
SVD is a supply voltage detector to monitor the power supply voltage on the V
external pin. The main features are listed below.
• Power supply voltage to be detected: Selectable from V
• Detectable voltage level:
• Detection results:
• Interrupt:
• Supports intermittent operations:
Figure 10.1.1 shows the configuration of SVD.
Clock generator
EXSVD
To system reset circuit
To interrupt controller
S1C17W22/W23 TECHNICAL MANUAL
(Rev. 1.3)
Selectable from among 30 levels (1.2 to 3.6 V)
- 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.
1 system (Low power supply voltage detection interrupt)
- 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.
SVD
MODEN
SVDMD[1:0]
CLK_SVD
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
SVDC[4:0]
VDSEL
V
DD
SVDSC[1:0]
SVDIE
SVDRE[3:0]
Figure 10.1.1 SVD Configuration
Seiko Epson Corporation
10 SUPPLY VOLTAGE DETECTOR (SVD)
pin or the voltage applied to an
DD
and an external power supply (EXSVD)
DD
Sampling timing
generator
Voltage
comparator
circuit
Detection
result counter
Interrupt/reset
control circuit
SVDDT
SVDIF
10-1
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