MC68HC908JB8 Datasheet, PDF (163/286 Pages) Motorola, Inc – MICROCONTROLLERS

Technical Data — MC68HC908JB8•MC68HC08JB8•MC68HC08JT8
Section 10. Monitor ROM (MON)
10.1 Contents
10.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
10.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
10.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164
10.4.1 Entering Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
10.4.2 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169
10.4.3 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
10.4.4 Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
10.4.5 Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
10.4.6 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
10.5 Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
10.2 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 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 voltage,
V_DD + V_HI, as long as vector addresses $FFFE and $FFFF are blank,
thus reducing the hardware requirements for in-circuit programming.
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
Monitor ROM (MON)
Technical Data
163