mc68hc08qa24 Freescale Semiconductor, Inc, mc68hc08qa24 Datasheet - Page 138

• Manufacturer Part Number: mc68hc08qa24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

System Integration Module (SIM)
10.4.2 Active Resets from Internal Sources
Technical Data
136
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
Figure
illegal opcode, COP timeout, LVI, or POR. (See
for LVI or POR 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
Figure
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
IRST
RST
IAB
10-5. An internal reset can be caused by an illegal address,
10-5.
System Integration Module (SIM)
Figure 10-6. Sources of Internal Reset
Figure 10-5. Internal Reset Timing
ILLEGAL ADDRESS RST
ILLEGAL OPCODE RST
RST PULLED LOW BY MCU
COPRST
32 CYCLES
POR
LVI
INTERNAL RESET
32 CYCLES
Figure
Freescale Semiconductor
10-6.) Note that
MC68HC08QA24
VECTOR HIGH