M68HC08 datasheet(119/288 Pages) FREESCALE

119 / 288 page

Monitor ROM (MON)

MC68HC908BD48 — Rev. 2.1

Data Sheet

Freescale Semiconductor

Monitor ROM (MON)

119

Alternatively, the host can send a RUN command, which executes an

RTI, and this can be used to send control to the address on the stack

pointer.

The COP module is disabled in monitor mode as long as VTST is applied

to the IRQ or the RST pin. (See Section 7. System Integration Module

(SIM) for more information on modes of operation.)

Table 9-2 is a summary of the differences between user mode and

monitor mode.

9.4.2 Data Format

Communication with the monitor ROM is in standard non-return-to-zero

(NRZ) mark/space data format. (See Figure 9-2 and Figure 9-3.)

Figure 9-2. Monitor Data Format

Figure 9-3. Sample Monitor Waveforms

Table 9-2. Mode Differences

Modes

Functions

COP

Reset

Vector

High

Reset

Vector

Low

SWI

Vector

High

SWI

Vector

Low

User

Enabled

$FFFE

$FFFF

$FFFC

$FFFD

Monitor

Disabled(1)

Notes:

1. If the high voltage (VTST) is removed from the IRQ pin, the SIM asserts its COP enable

output. The COP is a mask option enabled or disabled by the COPD bit in the configuration

$FEFE

$FEFF

$FEFC

$FEFD

BIT 5

START

BIT

BIT 0

BIT 1

STOP

BIT

START

BIT

BIT 2

BIT 3

BIT 4

BIT 6

BIT 7

BIT 5

START

BIT

BIT 0

BIT 1

STOP

BIT

START

BIT

BIT 2

BIT 3

BIT 4

BIT 6

BIT 7

START

BIT

BIT 0

BIT 1

STOP

BIT

BIT 2

$A5

BREAK

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

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