MC68HC908GT16 Datasheet, PDF (209/412 Pages) Motorola, Inc – Microcontrollers

Technical Data — MC68HC908GT16 • MC68HC908GT8
Section 15. Monitor ROM (MON)
15.1 Contents
15.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
15.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
15.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
15.4.1 Entering Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
15.4.2 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
15.4.3 Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
15.4.4 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219
15.4.5 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
15.5 Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224
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.
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
MOTOROLA
Monitor ROM (MON)
Technical Data
209