MC68HC908MR16/MC68HC908MR32
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Rev. 5.0
Advance Information
MOTOROLA
Monitor ROM (MON)
185
Advance Information
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MC68HC908MR16/MC68HC908MR32
Section 10. Monitor ROM (MON)
10.1 Contents
10.2
10.3
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .185
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
10.4
10.4.1
10.4.1.1
10.4.1.2
10.4.2
10.4.3
10.4.4
10.4.5
10.4.6
10.5
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
Entering Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . .188
Normal Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . .188
Forced Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . .190
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
Break Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192
Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
10.2 Introduction
This section describes the monitor read-only memory (ROM). The
monitor ROM (MON) allows complete testing of the microcontroller unit
(MCU) through a single-wire interface with a host computer.
Monitor mode entry can be achieved without the use of V
TST
as long as
vector addresses $FFFE and $FFFF are blank, thus reducing the
hardware requirements for in-circuit programming.