LOW VOLTAGE RESET

S3C84E5/C84E9/P84E9

 

 

Watchdog RESET

nRESET

N.F

Longger than 1us

VDD

VIN

+

VREF Comparator N.F

-

Longger than 1us

VDD

VREF BGR

Internal System

RESET

When the VDD level is lower than 2.9V

NOTES:

1.The target of voltage detection level is 2.9 V at VDD = 5 V

2.BGR is Band Gap voltage Reference

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.

16-2

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Samsung S3C84E5 user manual Low Voltage Reset Circuit, 16-2