MC68HC908JL8 MOTOROLA [Motorola, Inc], MC68HC908JL8 Datasheet - Page 90

• Manufacturer Part Number: MC68HC908JL8
• Description: Motorola reserves the right to make changes without further notice to any products herein
• Manufacturer: MOTOROLA [Motorola, Inc]

System Integration Module (SIM)
7.4 Reset and System Initialization
7.4.1 External Pin Reset
Technical Data
90
ICLK
RST
IAB
The MCU has these reset sources:
All of these resets produce the vector $FFFE–$FFFF ($FEFE–$FEFF in
Monitor mode) and assert the internal reset signal (IRST). IRST causes
all registers to be returned to their default values and all modules to be
returned to their reset states.
An internal reset clears the SIM counter (see 7.5 SIM Counter), but an
external reset does not. Each of the resets sets a corresponding bit in
the reset status register (RSR). (See
The RST pin circuits include an internal pull-up device. Pulling the
asynchronous RST pin low halts all processing. The PIN bit of the reset
status register (RSR) is set as long as RST is held low for a minimum of
67 ICLK cycles, assuming that the POR was not the source of the reset.
See
PC
Freescale Semiconductor, Inc.
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Table 7-2
For More Information On This Product,
Reset Type
Figure 7-4. External Reset Timing
Power-on reset module (POR)
External reset pin (RST)
Computer operating properly module (COP)
Low-voltage inhibit module (LVI)
Illegal opcode
Illegal address
All others
POR
System Integration Module (SIM)
Go to: www.freescale.com
for details.
Table 7-2. PIN Bit Set Timing
Figure 7-4
Number of Cycles Required to Set PIN
4163 (4096 + 64 + 3)
7.8 SIM
shows the relative timing.
67 (64 + 3)
VECT H VECT L
Registers.)
MC68HC908JL8
MOTOROLA
—
Rev. 2.0