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11. Supply Voltage Detector (SVD3)
11.1. Overview
SVD3 is a supply voltage detector to monitor the VDD voltage, or an external voltage detection input
pin. The main features are listed below.
Power supply voltage to be detected:
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
Clock
generator
EXSVD
0
EXSVD
1
To system reset circuit
To CPU core
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
Selectable from VDD and 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 detected.
1 system (Low power supply voltage detection interrupt)
- Three detection cycles are selectable.
- Low power supply voltage detection count function to
generate an interrupt/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 S1C31D50
VDD and two externally input voltages (EXSVD0, EXSVD1)
VDD: 28 levels (1.8 to 5.0 V)/external voltage: 32 levels (1.2 to 5.0 V)
SVD3
MODEN
SVDMD[1:0]
CLK_SVD3
CLKSRC[1:0]
CLKDIV[2:0]
DBRUN
SVDC[4:0]
External
EXSEL
voltage
selector
VDSEL
V
DD
SVDSC[1:0]
SVDIE
SVDRE[3:0]
Figure 11.1.1 SVD3 Configuration
Seiko Epson Corporation
(Note: See the table below.)
S1C31D50
Sampling
timing
generator
Voltage
comparator
circuit
Detection
result
counter
Interrupt/reset
control circuit
SVDDT
SVDIF
11-1
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