MC68HC908RF2 Datasheet, PDF (87/254 Pages) Motorola, Inc – HCMOS Microcontroller Unit

System Integration Module (SIM)
Reset and System Initialization
6.4.1 External Pin Reset
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 CGMXCLK cycles, assuming that neither the POR
nor the LVI was the source of the reset.
Figure 6-4 shows the relative timing of an external reset recovery.
RST
CGMOUT
PULLED LOW EXTERNAL
PULLED HIGH EXTERNAL
IAB
PC
VECT H VECT L
Figure 6-4. External Reset Recovery Timing
MC68HC908RF2 — Rev. 1
MOTOROLA
System Integration Module (SIM)
Advance Information
87