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S3C8248/C8245/P8245/C8247/C8249/P8249
18
OVERVIEW
The S3C8248/C8245/C8247/C8249 micro-controller has a built-in VLD (Voltage Level Detector) circuit which
allows detection of power voltage drop or external input level through software. Turning the VLD operation on
and off can be controlled by software. Because the IC consumes a large amount of current during VLD operation.
It is recommended that the VLD operation should be kept OFF unless it is necessary. Also the VLD criteria
voltage can be set by the software. The criteria voltage can be set by matching to one of the 4 kinds of voltage
below that can be used.
2.2 V, 2.4 V, 3.0 V or 4.0 V (V
The V
block works only when VLDCON.2 is set. If V
LD
VLDCON.1–.0, VLDCON.3 will be set. If V
minimize current consumption, do not operate the VLD block.
V
Pin
DD
VLDCON.4
ExtRef/P2.7
P2CONH.7-.6
ExtRef Input
Enable
VOLTAGE LEVEL DETECTOR
reference voltage), or external input level (External reference voltage)
DD
level is higher, VLDCON.3 will be cleared. When users need to
DD
Voltage
f
Level
VLD
Detector
MUX
Voltage
Level
Setting
Figure 18-1. Block Diagram for Voltage Level Detect
level is lower than the reference voltage selected with
DD
VOLTAGE LEVEL DETECTOR
VLDCON.3
VLD Out
VLDCON.2
VLD Run
VLDCON.1
VLDCON.0
Set the Level
18-1
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