Freescale Semiconductor MC68HC08KH12 manual Mode Differences, 153

When the host computer has completed downloading code into the MCU RAM, This code can be executed by driving PTA0 low while asserting RST low and then high. The internal monitor ROM firmware will interpret the low on PTA0 as an indication to jump to RAM, and execution control will then continue from RAM. Execution of an SWI from the downloaded code will return program control to the internal monitor ROM firmware. Alternatively, the host can send a RUN command, which executes an RTI, and this can be used to send control to the address on the stack pointer.

The COP module is disabled in monitor mode as long as VDD + VHI is

applied to either the IRQ1/VPP pin or the RST pin. (See Section 7. System Integration Module (SIM) for more information on modes of

operation.)

Table 10-2is a summary of the differences between user mode and

monitor mode.

Table 10-2. Mode Differences

			Functions
Modes
		Reset	Reset	Break	Break	SWI	SWI
	COP	Vector	Vector	Vector	Vector	Vector	Vector
		High	Low	High	Low	High	Low
User	Enabled	$FFFE	$FFFF	$FFFC	$FFFD	$FFFC	$FFFD
Monitor	Disabled(1)	$FEFE	$FEFF	$FEFC	$FEFD	$FEFC	$FEFD

1.If the high voltage (VDD + VHI) is removed from the IRQ1/VPP pin or the RST pin, the SIM asserts its COP enable output. The COP is a mask option enabled or disabled by the COPD bit in the configuration register.

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