mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 89
mc68hc08az60
Manufacturer Part Number
mc68hc08az60
Description
M68hc08 Family Of 8-bit Microcontroller Units Mcus
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC08AZ60.pdf
(452 pages)
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Active Resets from
Internal Sources
7-sim
MOTOROLA
CGMOUT
RST
IAB
PC
nor the LVI was the source of the reset. See
4
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.
shows the relative timing.
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 4. External Reset Timing
System Integration Module (SIM)
Reset Type
All others
POR/LVI
Go to: www.freescale.com
Table 3. PIN Bit Set Timing
Number of Cycles Required to Set PIN
Figure
VECT H
4163 (4096 + 64 + 3)
6). Note that for LVI or POR
VECT L
67 (64 + 3)
System Integration Module (SIM)
Table 3
Reset and System Initialization
MC68HC08AZ60 — Rev 1.0
Figure
for details.
5.
Figure
Figure
89
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