MC68HC908JK1 Datasheet, PDF (101/210 Pages) Motorola, Inc – MC68HC908JK1

Technical Data — MC68H(R)C908JL3
Section 9. Monitor ROM (MON)
9.1 Contents
9.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
9.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
9.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
9.4.1 Entering Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
9.4.2 Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
9.4.3 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
9.4.4 Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
9.4.5 Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
9.4.6 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
9.5 Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
9.2 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. 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 test
voltage, V_DD + V_HI, as long as vector addresses $FFFE and $FFFF are
blank, thus reducing the hardware requirements for in-circuit
programming.
MC68H(R)C908JL3 — Rev. 1.0
MOTOROLA
Monitor ROM (MON)
Technical Data
101