MC68HC908MR8 Datasheet, PDF (187/372 Pages) Motorola, Inc – Microcontrollers

Technical Data — MC68HC908MR8
Section 10. Monitor ROM (MON)
10.1 Contents
10.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
10.3 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
10.4 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . .188
10.4.1 Entering Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . .188
10.4.2 Forced Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . .190
10.4.3 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
10.4.4 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
10.4.5 Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192
10.4.6 Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192
10.4.7 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .193
10.5 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 2-wire interface with a host computer.
10.3 Features
Features of the monitor ROM include:
• Normal user-mode pin functionality
• Standard mark/space non-return-to-zero (NRZ) communication
with host computer
• 9600 baud communication with host computer
• Execution of code in random-access memory (RAM) or ROM
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Monitor ROM (MON)
Technical Data
187