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M68ICS08GR 데이터시트(PDF) 62 Page - Freescale Semiconductor, Inc

부품명 M68ICS08GR
상세설명  M68HC08 Microcontrollers
PDF  408 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

M68ICS08GR 데이터시트(HTML) 62 Page - Freescale Semiconductor, Inc

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Resets and Interrupts
Technical Data
MC68HC908GR8 — Rev 4.0
62
Resets and Interrupts
MOTOROLA
4.3.2 External Reset
A logic 0 applied to the RST pin for a time, tIRL, generates an external
reset. An external reset sets the PIN bit in the SIM reset status register.
4.3.3 Internal Reset
Sources:
•
Power-on reset (POR)
•
Computer operating properly (COP)
•
Low-power reset circuits
•
Illegal opcode
•
Illegal address
All internal reset sources pull the RST pin low for 32 CGMXCLK cycles
to allow resetting of external devices. The MCU is held in reset for an
additional 32 CGMXCLK cycles after releasing the RST pin.
Figure 4-1. Internal Reset Timing
4.3.3.1 Power-On Reset
A power-on reset is an internal reset caused by a positive transition on
the VDD pin. VDD at the POR must go completely to 0 V to reset the MCU.
This distinguishes between a reset and a POR. The POR is not a brown-
out detector, low-voltage detector, or glitch detector.
RST PIN
PULLED LOW BY MCU
INTERNAL
32 CYCLES
32 CYCLES
CGMXCLK
RESET
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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