MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 119
MC68HC908AZ32ACFU
Manufacturer Part Number
MC68HC908AZ32ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AZ32ACFU.pdf
(468 pages)
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7.4.2 Active Resets from Internal Sources
68HC908AZ32A — Rev 0.0
MOTOROLA
CGMOUT
RST
IAB
PC
All internal reset sources actively pull the RST pin low for 32 CGMXCLK
cycles to allow resetting of external peripherals. The internal reset signal
IRST continues to be asserted for an additional 32 cycles (see
5). An internal reset can be caused by an illegal address, illegal opcode,
COP timeout, LVI, or POR (see
resets, the SIM cycles through 4096 CGMXCLK cycles during which the
SIM forces the RST pin low. The internal reset signal then follows the
sequence from the falling edge of RST shown in
The COP reset is asynchronous to the bus clock.
The active reset feature allows the part to issue a reset to peripherals
and other chips within a system built around the MCU.
CGMXCLK
Freescale Semiconductor, Inc.
IRST
RST
IAB
For More Information On This Product,
Figure 7-4. External Reset Timing
System Integration Module (SIM)
Go to: www.freescale.com
Figure 7-5. Internal Reset Timing
RST PULLED LOW BY MCU
32 CYCLES
Figure
VECT H
7-6). Note that for LVI or POR
VECT L
System Integration Module (SIM)
32 CYCLES
Reset and System Initialization
Figure
Advance Information
7-5.
VECTOR HIGH
Figure 7-
119
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