57
9152BINDCO02/10
ATA8743
Figure 16-3. MCU Start-up, RESET
Extended Externally
Note:
1. Before rising, the supply has to be between V
PORMIN
and V
PORMAX
to ensure a Reset.
16.0.4
External Reset
An External Reset is generated by a low level on the RESET
pin if enabled. Reset pulses longer
than the minimum pulse width (see System and Reset Characterizations on page 198) will
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
RST
on its positive
edge, the delay counter starts the MCU after the Time-out period t
TOUT
has expired.
Table 16-1. Power On Reset Specifications
Symbol
Parameter
Min
Typ
Max
Units
V
POT
Power-on Reset Threshold Voltage (rising)
1.1
1.4
1.7
V
Power-on Reset Threshold Voltage (falling)
()
0.8
1.3
1.6
V
V
PORMAX
VCC Max. start voltage to ensure internal
Power-on Reset signal
0.4
V
V
PORMIN
VCC Min. start voltage to ensure internal
Power-on Reset signal
-0.1
V
V
CCRR
VCC Rise Rate to ensure Power-on Reset
0.01
V/ms
V
RST
RESET
Pin Threshold Voltage
0.1 V
CC
0.9V
CC
V
RESET
IME-OUT
NTERNAL
RE ET
t
TOUT
V
POT
V
RST
V
CC
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