MC68HC908GP32 Datasheet, PDF (285/410 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Freescale Semiconductor, Inc.
System Integration Module (SIM)
Reset and System Initialization
19.4.1 External Pin Reset
The RST pin circuit includes an internal pullup 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 CGMXCLK cycles, assuming that neither the POR nor
the LVI was the source of the reset. See Table 19-2 for details. Figure
19-4 shows the relative timing.
Reset Type
POR/LVI
All others
Table 19-2. PIN Bit Set Timing
Number of Cycles Required to Set PIN
4163 (4096 + 64 + 3)
67 (64 + 3)
CGMOUT
RST
IAB PC
VECT H VECT L
Figure 19-4. External Reset Timing
MC68HC908GP32•MC68HC08GP32 — Rev. 6
MOTOROLA
System Integration Module (SIM)
For More Information On This Product,
Go to: www.freescale.com
Technical Data
283