MC68HC05X16 Datasheet, PDF (147/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
10.2.4 Hardware controlled interrupt sequence
The following three functions: reset, STOP and WAIT, are not in the strictest sense interrupts. However,
they are acted upon in a similar manner. Flowcharts for STOP and WAIT are shown in Figure 2-4.
RESET: A reset condition causes the program to vector to its starting address, which is contained
in memory locations $3FFE (MSB) and $3FFF (LSB). The I-bit in the condition code
register is also set, to disable interrupts.
STOP:
The STOP instruction puts the processor to ‘sleep’ and, if the MCAN module is already
in SLEEP mode, it causes the oscillator to be turned off until an external, WOI or CIRQ
interrupt occurs or the device is reset.
WAIT:
The WAIT instruction causes all processor clocks to stop, but leaves the timer clocks
running. This ‘rest’ state of the processor can be cleared by reset, an external or WOI
interrupt, a timer interrupt or an SCI interrupt. There are no special WAIT vectors for
these individual interrupts.
10
MC68HC05X16
RESETS AND INTERRUPTS
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