M68HC08 datasheet(134/332 Pages) FREESCALE

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Monitor ROM (MON)

Technical Data

MC68HC908JB16 — Rev. 1.1

134

Monitor ROM (MON)

Freescale Semiconductor

The MCU executes the SWI and PSHH instructions when it enters

monitor mode. The RUN command tells the MCU to execute the PULH

and RTI instructions. Before sending the RUN command, the host can

modify the stacked CPU registers to prepare to run the host program.

The READSP command returns the incremented stack pointer value,

SP + 1. The high and low bytes of the program counter are at addresses

SP + 5 and SP + 6.

Figure 9-7. Stack Pointer at Monitor Mode Entry

Table 9-9. RUN (Run User Program) Command

Description

Executes RTI instruction

Operand

None

Data

Returned

None

Opcode

$28

Command Sequence

RUN

ECHO

SENT TO

MONITOR

CONDITION CODE REGISTER

ACCUMULATOR

LOW BYTE OF INDEX REGISTER

HIGH BYTE OF PROGRAM COUNTER

LOW BYTE OF PROGRAM COUNTER

SP + 1

SP + 2

SP + 3

SP + 4

SP + 5

SP + 6

HIGH BYTE OF INDEX REGISTER

SP + 7

M68HC08 Datasheet(PDF) 134 Page - Freescale Semiconductor, Inc

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