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| AT90CAN64_14 Datasheet, PDF (53/428 Pages) ATMEL Corporation – High-performance, Low-power AVR 8-bit Microcontroller | |||
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AT90CAN32/64/128
VCC rise. The RESET signal is activated again, without any delay, when VCC decreases below
the detection level.
Figure 7-2.
VCC
MCU Start-up, RESET Tied to VCC
VCCRR
VPOR
VPOT
RESET
VCCRR
TIME-OUT
INTERNAL
RESET
tTOUT
Figure 7-3. MCU Start-up, RESET Extended Externally
VCC
VCCRR
VPOR
RESET
VRST
7.1.4
TIME-OUT
INTERNAL
RESET
tTOUT
Note: If VPOR or VCCRR parameter range can not be followed, an External Reset is required.
External Reset
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see Table 7-1) 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 â VRST â on its positive edge, the delay counter starts the MCU after
the Time-out period â tTOUT â has expired.
53
7679HâCANâ08/08
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