MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 145
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MC68HC908LK24
Manufacturer Part Number
MC68HC908LK24
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908LK24.pdf
(465 pages)
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9.4.1 External Pin Reset
9.4.2 Active Resets from Internal Sources
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
NOTE:
The RST pin circuit includes an internal pull-up device. Pulling the
asynchronous RST pin low halts all processing. The PIN bit of the SIM
reset status register (SRSR) is set as long as RST is held low for a
minimum of 67 ICLK cycles, assuming that neither the POR nor the LVI
was the source of the reset. See
Figure 9-4
All internal reset sources actively pull the RST pin low for 32 ICLK cycles
to allow resetting of external peripherals. The internal reset signal IRST
continues to be asserted for an additional 32 cycles (see
internal reset can be caused by an illegal address, illegal opcode, COP
timeout, LVI, or POR (see
For LVI or POR resets, the SIM cycles through 4096 + 32 ICLK 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
Figure
CGMOUT
Freescale Semiconductor, Inc.
RST
IAB
For More Information On This Product,
Reset Type
All others
POR/LVI
9-5.
PC
System Integration Module (SIM)
shows the relative timing.
Go to: www.freescale.com
Figure 9-4. External Reset Timing
Table 9-2. PIN Bit Set Timing
Figure
Number of Cycles Required to Set PIN
Table 9-2
9-6).
4163 (4096 + 64 + 3)
67 (64 + 3)
for details.
System Integration Module (SIM)
Reset and System Initialization
VECT H VECT L
Figure
Data Sheet
9-5). An
145
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