MC68HC908GP20 Datasheet, PDF (205/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Advance Information — MC68HC908GP20
Section 15. Monitor ROM (MON)
15.1 Contents
15.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
15.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
15.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
15.4.1 Entering Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
15.4.2 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
15.4.3 Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
15.4.4 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
15.4.5 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
15.5 Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
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.
MC68HC908GP20 — Rev 2.1
Freescale Semiconductor
Advance Information
205