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AT90SCR100 Fiches technique(PDF) 53 Page - ATMEL Corporation

No de pièce AT90SCR100
Description  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 Fiches technique(HTML) 53 Page - ATMEL Corporation

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53
TPR0327AY–SMS–30Jan09
AT90SCR100
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after VCC rise. The RESET signal is activated again, without any delay,
when VCC decreases below the detection level.
Figure 9-2.
MCU Start-up, RESET Tied to VCC
Figure 9-3.
MCU Start-up, RESET Extended Externally
9.2.2
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 9-1) 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 – VRST – on its positive edge, the delay counter starts the MCU after
the Time-out period – tTOUT – has expired.
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
V CC



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