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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
CLKSRC[1:0]
Clock generator
EXSVD0
EXSVD1
To system reset circuit
To CPU core
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)
DD
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 S1C31D50/D51
48-pin package
V
DD
V
: 28 levels (1.8 to 5.0 V)/external voltage: 32 levels (1.2 to 5.0 V)
DD
MODEN
SVDMD[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 external power sources (EXSVD0, EXSVD1)
DD
64-pin package
80-pin package
and two externally input voltages (EXSVD0, EXSVD1)
CLK_SVD3
Sampling timing
generator
Voltage
comparator
circuit
Interrupt/reset
control circuit
(Note: See the table below.)
100-pin package
SVDDT
Detection
SVDIF
result counter
11-1
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