ATA8741 ATMEL Corporation, ATA8741 Datasheet - Page 57
ATA8741
Manufacturer Part Number
ATA8741
Description
Manufacturer
ATMEL Corporation
Datasheet
1.ATA8741.pdf
(238 pages)
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16.0.4
9140B–INDCO–07/09
External Reset
Figure 16-3. MCU Start-up, RESET Extended Externally
Table 16-1.
Note:
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer
than the minimum pulse width (see
generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate
a reset. When the applied signal reaches the Reset Threshold Voltage – V
edge, the delay counter starts the MCU after the Time-out period – t
Symbol
V
V
V
V
V
POT
PORMAX
PORMIN
CCRR
RST
INTERNAL
TIME-OUT
RESET
1. Before rising, the supply has to be between
RESET
V
CC
Power On Reset Specifications
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
VCC Max. start voltage to ensure internal
Power-on Reset signal
VCC Min. start voltage to ensure internal
Power-on Reset signal
VCC Rise Rate to ensure Power-on Reset
RESET Pin Threshold Voltage
V
POT
“System and Reset Characterizations” on page
V
RST
t
V
TOUT
PORMIN
()
and V
0.1 V
0.01
Min
-0.1
1.1
0.8
PORMAX
CC
TOUT
Typ
1.4
1.3
to ensure a Reset.
– has expired.
RST
ATA8741
– on its positive
0.9V
Max
1.7
1.6
0.4
CC
198) will
Units
V/ms
V
V
V
V
V
57
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