Svd3 Control Register - Epson S1C31D50 Technical Manual

11 SUPPLY VOLTAGE DETECTOR (SVD3)
SVD3CLK.
CLKDIV[2:0] bits
0x7, 0x6
0x5
0x4
0x3
0x2
0x1
0x0
(Note) The oscillation circuits/external input that are not supported in this IC cannot be
selected as the clock source.
Note: The clock frequency should be set to around 32 kHz.

SVD3 Control Register

Register name Bit
SVD3CTL 15
14–13 SVDSC[1:0]
12–8 SVDC[4:0]
7–4 SVDRE[3:0]
3
2–1 SVDMD[1:0]
0
Bit 15 VDSEL
This bit selects the power supply voltage to be detected by SVD3.
1 (R/WP): Voltage applied to the EXSVDn pin
0 (R/WP): V
DD
Bits 14–13 SVDSC[1:0]
These bits set the condition to generate an interrupt/reset (number of successive low voltage detec-
tions) in intermittent operation mode (SVD3CTL.SVDMD[1:0] bits = 0x1 to 0x3).
Table 11.6.2 Interrupt/Reset Generating Condition in Intermittent Operation Mode
SVD3CTL.SVDSC[1:0] bits
0x3
0x2
0x1
0x0
This setting is ineffective in continuous operation mode (SVD3CTL.SVDMD[1:0] bits = 0x0).
Bits 12–8 SVDC[4:0]
These bits select an SVD detection voltage V
low voltage.
Table 11.6.3 Setting of SVD Detection Voltage V
For the configurable range and voltage values, refer to "Supply Voltage Detector Characteristics, SVD
detection voltage V
11-6
Table 11.6.1 Clock Source and Division Ratio Settings
0x0
IOSC
Reserved
1/512
1/256
1/128
1/64
1/32
1/16
Bit name Initial
VDSEL 0
0x0
0x1e
0x0
EXSEL 0
0x0
MODEN 0
Low power supply voltage is successively detected eight times.
Low power supply voltage is successively detected four times.
Low power supply voltage is successively detected twice.
Low power supply voltage is successively detected once.
SVD3CTL.SVDC[4:0] bits
0x1f
0x1e
0x1d
:
0x02
0x01
0x00
/EXSVD detection voltage V
SVD
Seiko Epson Corporation
SVD3CLK.CLKSRC[1:0] bits
0x1 0x2
OSC1 OSC3
1/1 Reserved
1/512
1/256
1/128
1/64
1/32
1/16
Reset R/W
H1 R/WP –
H0 R/WP Writing takes effect when the
SVD3CTL.SVDMD[1:0] bits are not 0x0.
H1 R/WP –
H1 R/WP
H1 R/WP
H0 R/WP
H1 R/WP
Interrupt/reset generating condition
/EXSVD detection voltage V
SVD
/EXSVD Detection Voltage V
SVD
SVD detection voltage V
EXSVD detection voltage V
High
↑
↓
Low
" in the "Electrical Characteristics" chapter.
SVD_EXT
0x3
EXOSC
1/1
Remarks
for detecting
SVD_EXT
SVD_EXT
/
SVD
[V]
SVD_EXT
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)