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11 Supply Voltage Detector (SVD3)
11.1 Overview
SVD3 is a supply voltage detector to monitor the V
features are listed below.
• Power supply voltage to be detected: Selectable from V
• Detectable voltage level:
• Detection results:
• Interrupt:
• Supports intermittent operations:
Figure 11.1.1 shows the configuration of SVD3.
Item
Power supply voltage to be detected
Detectable voltage level
SVD3
Clock generator
EXSVD0
EXSVD1
To system reset circuit
To CPU
S1C31D41 TECHNICAL MANUAL
(Rev. 1.1)
DD
external power sources (EXSVD0, 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 11.1.1 SVD3 Configuration of S1C31D41
32-pin package
V
and two externally input
DD
voltages (EXSVD0)
V
: 28 levels (1.8 to 5.0 V)/external voltage: 32 levels (1.2 to 5.0 V)
DD
MODEN
SVDMD[1:0]
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
SVDC[4:0]
EXSEL
External voltage
selector
VDSEL
V
DD
SVDSC[1:0]
SVDIE
SVDRE[3:0]
Figure 11.1.1 SVD3 Configuration
Seiko Epson Corporation
11 SUPPLY VOLTAGE DETECTOR (SVD3)
voltage, or an external voltage detection input pin. The main
and
DD
(Note: See the table below.)
48-pin package
V
and two externally input voltages (EXSVD0, EXSVD1)
DD
CLK_SVD3
Sampling timing
generator
Voltage
comparator
circuit
Interrupt/reset
control circuit
(Note: See the table below.)
64-pin package
SVDDT
Detection
SVDIF
result counter
11-1
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