MC68HC908GR4MP datasheet(138/286 Pages) FREESCALE

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Monitor ROM (MON)

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

138

Freescale Semiconductor

A brief description of each monitor mode command is given in Table 15-4 through Table 15-9.

Table 15-4. READ (Read Memory) Command

Description

Read byte from memory

Operand

2-byte address in high-byte:low-byte order

Data Returned

Returns contents of specified address

Opcode

$4A

Command Sequence

Table 15-5. WRITE (Write Memory) Command

Description

Write byte to memory

Operand

2-byte address in high-byte:low-byte order; low byte followed by data byte

Data Returned

None

Opcode

$49

Command Sequence

Table 15-6. IREAD (Indexed Read) Command

Description

Read next 2 bytes in memory from last address accessed

Operand

2-byte address in high byte:low byte order

Data Returned

Returns contents of next two addresses

Opcode

$1A

Command Sequence

READ

ECHO

SENT TO

MONITOR

ADDRESS

HIGH

ADDRESS

HIGH

ADDRESS

LOW

DATA

RETURN

ADDRESS

LOW

WRITE

ECHO

FROM

HOST

ADDRESS

HIGH

ADDRESS

HIGH

ADDRESS

LOW

ADDRESS

LOW

DATA

IREAD

ECHO

FROM

HOST

DATA

RETURN

DATA

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