Samsung S3C8245 User Manual
VOLTAGE LEVEL DETECTOR
S3C8245/P8245/C8249/P8249
18-2
VOLTAGE LEVEL DETECTOR CONTROL REGISTER (VLDCON)
The bit 2 of VLDCON controls to run or disable the operation of Voltage level detect. Basically this V
VLD
is set as
2.2 V by system reset and it can be changed in 4 kinds voltages by selecting Voltage Level Detect Control register
(VLDCON). When you write 2 bit data value to VLDCON, an established resistor string is selected and the V
(VLDCON). When you write 2 bit data value to VLDCON, an established resistor string is selected and the V
VLD
is
fixed in accordance with this resistor. Table 18-1 shows specific V
VLD
of 4 levels.
Voltage Level Detect Control
F6H, Set 1, Bank 1, R/W, Reset : 00H
.7
.6
.5
.4
.3
.2
.1
.0
MSB
LSB
Not use
+
Comparator
M
BANDGAP
VLD Enable/Disable
VLD
OUT
Bias
V
REF
V
IN
R
VLD
ExtRef
Resistor String
P2CONH.7-.6
V
BAT
NOTE: The reset value of VLDCON is #00H.
Figure 18-2. Voltage Level Detect Circuit and Control Register
Table 18-1. VLDCON Value and Detection Level
VLDCON .1–.0
V
VLD
0 0
2.2 V
0 1
2.4 V
1 0
3.0 V
1 1
4.0 V