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9 Supply Voltage Detector (SVD3)
9.1 Overview
SVD3 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 9.1.1 shows the configuration of SVD3.
Item
Power supply voltage to be detected
Detectable voltage level
SVD3
Clock generator
EXSVD1
EXSVD0
To system reset circuit
To interrupt controller
S1C17M12/M13 TECHNICAL MANUAL
(Rev. 1.2)
and external power sources (EXSVD0 and EXSVD1)
Selectable from among 32 levels (max.)
- 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.
Table 9.1.1 SVD3 Configuration of S1C17M12/M13
S1C17M12
V
and two externally input voltages (EXSVD0 and EXSVD1)
DD
V
: 28 levels (1.8 to 5.0 V)/external voltage: Max. 32 levels (1.2 V to V
DD
MODEN
SVDMD[1:0]
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
SVDC[4:0]
EXSEL
EXSVD0/1
selector
VDSEL
V
DD
SVDSC[1:0]
SVDIE
SVDRE[3:0]
Figure 9.1.1 SVD3 Configuration
Seiko Epson Corporation
9 SUPPLY VOLTAGE DETECTOR (SVD3)
DD
DD
(Note: See the table below.)
CLK_SVD3
Sampling timing
generator
Voltage
comparator
circuit
Interrupt/reset
control circuit
pin or the voltage applied to an
(Note: See the table below.)
S1C17M12
)
DD
SVDDT
Detection
SVDIF
result counter
9-1
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