MC68HC08AZ16 Datasheet, PDF (79/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

System Integration Module (SIM)
CGMOUT
RST
IAB PC
VECT H VECT L
Figure 3. External reset timing
Active resets from
internal sources
All internal reset sources actively pull the RST pin low for 32 CGMXCLK
cycles to allow for resetting of external peripherals. The internal reset
signal IRST continues to be asserted for an additional 32 cycles. See
Figure 4. An internal reset can be caused by an illegal address, illegal
opcode, COP timeout, LVI, or POR. See Figure 5. Note that 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 as shown in Figure 4.
IRST
RST
CGMXCLK
IAB
RST PULLED LOW BY MCU
32 CYCLES
32 CYCLES
Figure 4. Internal reset timing
VECTOR HIGH
MC68HC08AZ32
78
System Integration Module (SIM)
8-sim
MOTOROLA