Motorola MC9S12DP256 User Manual

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A) Determine if Auto Start in enabled and proceed to vector if not a value of $FFFF.

B) Set Stack, Initialize memory map and SCI0 port and send prompt.

C) Receive first character from Console port and execute monitor if ASCII text / command,

else start utility mode for programming services.

Enable Auto start, address is the vector

Disable Auto start

Fill memory with data

Set/Display user breakpoints

Erase entire on-chip EEPROM contents

Call user subroutine at <Address>

Begin/continue execution of user code

Display the Mon12 command summary

Load S-Records into memory, P = Paged S2

Memory Display Bytes

Modify Memory Bytes (8 bit values)

Modify memory Words (16 bit values)

Move a block of memory

Display all CPU registers

Modify CPU Register Contents

Trace until address

Trace <count> instructions

All interrupt services under MON12 are provided through the ram vector table, see Table 2.
Each location in the table is initialized to a value of $0000 to cause the trap of an unscheduled
interrupt.  Any nonzero value will allow the interrupt to proceed to the user's service routine
that should be located at the provided address value.  Interrupt service delay is plus 21 cycles
over standard interrupt service.

To use vectors specified in the table, the user must insert the address of the interrupt service
routine during software initialization into the ram interrupt table. For an example, for the IRQ
vector, the following is performed:

Example:

IRQ Service routine label = IRQ_SRV
Ram Vector Table address is defined in table below, IRQ vector definition:
VIRQ EQU $3EF2 ; define ram table vector location

Place IRQ service routine address in the table:

MOVW

#IRQ_SRV,VIRQ