mc68hc908gp20 Freescale Semiconductor, Inc, mc68hc908gp20 Datasheet - Page 70

• Manufacturer Part Number: mc68hc908gp20
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

4.2 Introduction
4.3 Resets
4.3.1 Effects
4.3.2 External Reset
Advance Information
70
Resets and interrupts are responses to exceptional events during
program execution. A reset re-initializes the MCU to its startup condition.
An interrupt vectors the program counter to a service routine.
A reset immediately returns the MCU to a known startup condition and
begins program execution from a user-defined memory location.
A reset:
A logic 0 applied to the RST pin for a time, t
reset. An external reset sets the PIN bit in the SIM reset status register.
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Immediately stops the operation of the instruction being executed
Initializes certain control and status bits
Loads the program counter with a user-defined reset vector
address from locations $FFFE and $FFFF
Selects CGMXCLK divided by four as the bus clock
IRL
, generates an external
MC68HC908GP20
Freescale Semiconductor
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Rev 2.1