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MC68H(R)C908JL3E/JK3E/JK1E
—
Rev. 2.0
Technical Data
MOTOROLA
Monitor ROM (MON)
107
Technical Data – MC68H(R)C908JL3E/JK3E/JK1E
Section 9. Monitor ROM (MON)
9.1 Contents
9.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
9.3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
9.4
9.4.1
9.4.2
9.4.3
9.4.4
9.4.5
9.4.6
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
Entering Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . .110
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114
Break Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
9.5
Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
9.2 Introduction
This section describes the monitor ROM (MON) and the monitor mode
entry methods. The monitor ROM allows complete testing of the MCU
through a single-wire interface with a host computer. This mode is also
used for programming and erasing of FLASH memory in the MCU.
Monitor mode entry can be achieved without use of the higher test
voltage, V
DD
+ V
HI
, as long as vector addresses $FFFE and $FFFF are
blank, thus reducing the hardware requirements for in-circuit
programming.