MC908QT4MPE datasheet(147/184 Pages) FREESCALE

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Monitor Module (MON)

MC68HC908QY/QT Family Data Sheet, Rev. 5

Freescale Semiconductor

147

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 15-17. Stack Pointer at Monitor Mode Entry

Table 15-7. READSP (Read Stack Pointer) Command

Description

Reads stack pointer

Operand

None

Data Returned

Returns incremented stack pointer value (SP + 1) in

high-byte:low-byte order

Opcode

$0C

Command Sequence

Table 15-8. RUN (Run User Program) Command

Description

Executes PULH and RTI instructions

Operand

None

Data Returned

None

Opcode

$28

Command Sequence

READSP

ECHO

FROM HOST

RETURN

HIGH

LOW

RUN

ECHO

FROM HOST

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

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