MC68HC908AP16CFB datasheet(165/440 Pages) MOTOROLA

165 / 440 page

Monitor ROM (MON)

Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

165

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 10-7. Stack Pointer at Monitor Mode Entry

Table 10-9. RUN (Run User Program) Command

Description

Executes PULH and RTI instructions

Operand

None

Data

Returned

None

Opcode

$28

Command Sequence

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

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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