MC68HC908GP32 Datasheet, PDF (197/410 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Freescale Semiconductor, Inc.
Technical Data – MC68HC908GP32•MC68HC08GP32
Section 15. Monitor ROM (MON)
15.1 Contents
15.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
15.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
15.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
15.4.1 Entering Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
15.4.2 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .202
15.4.3 Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .202
15.4.4 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
15.4.5 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
15.5 Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
15.2 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. Monitor mode entry
can be achieved without use of the higher test voltage, V_TST, as long as
vector addresses $FFFE and $FFFF are blank, thus reducing the
hardware requirements for in-circuit programming.
MC68HC908GP32•MC68HC08GP32 — Rev. 6
MOTOROLA
Monitor ROM (MON)
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Technical Data
195