Rainbow Electronics ATmega103L - Manual (Page 26)

ATmega603/103
26
Figure 23. Reset Logic
Note: 1. The Power-On Reset will not work unless the supply voltage has been below V
POT
(falling)
Table 6. Reset Characteristics (V
CC
= 5V)
Symbol Parameter Condition Min Typ Max Units
V
POT
(1)
Power-On Reset Threshold (rising) 1.0 1.4 1.8 V
Power-On Reset Threshold (falling) 0.4 0.6 0.8 V
V
RST
RESET Pin Threshold Voltage V
CC
/2 V
T
TOUT
Reset Delay Time-Out Period
SUT = 00 5 CPU cycles
SUT = 01
SUT = 10
SUT = 11
0.4
3.2
12.8
0.5
4.0
16.0
0.6
4.8
19.2
ms
Power-On Reset
Circuit
Reset Circuit
Watchdog
Timer
On-Chip
RC-Oscillator
14-Stage Ripple Counter
Delay Unit
Q
Q S
R
INTERNAL
RESET
POR
VCC
XTAL1
RESET
PEN D Q
E
100-500K
10-50K
COUNTER RESET
SUT0 SUT1
Q8 Q11 Q13