Samsung S3C84I8 User Manual page 319

LOW VOLTAGE RESET
Watchdog RESET
nRESET
V
DD
NOTES:
1. The target of voltage detection level is 2.8 V at VDD = 5 V
2. BGR is Band Gap voltage Reference
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.
19-2
N.F
Longger than 1us
V
IN
+
Comparator
V
REF
-
V
DD
V
REF
BGR
Figure 19-1. Low Voltage Reset Circuit
N.F
Longger than 1us
NOTE
S3C84I8/F84I8/84I9/F84I9
Internal System
nRESET
When the V level
DD
is lower than 2.8V