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LOW VOLTAGE RESET S3C84E5/C84E9/P84E9
16-2
+
-
V
REF
BGR
V
IN
V
DD
Longger than 1us
N.F
Internal System
RESET
When the VDD level
is lower than 2.9V
Comparator
NOTES:
1. The target of voltage detection level is 2.9 V at V
DD
= 5 V
2. BGR is Band Gap voltage Reference
Longger than 1us
N.F
nRESET
Watchdog RESET
V
REF
V
DD
Figure 16-1. Low Voltage Reset Circuit
NOTE
To program the duration of the oscillation stabilization interval, you make the appropriate settings to the
basic timer control register, BTCON, before entering Stop mode. Also, if you do not want to use the basic
timer watchdog function (which causes a system reset if a basic timer counter overflow occurs), you can
disable it by writing '1010B' to the upper nibble of BTCON.