MC68HC908KX8 Datasheet, PDF (255/310 Pages) Motorola, Inc – Microcontrollers

Technical Data — MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8
Section 18. Monitor ROM (MON)
18.1 Contents
18.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
18.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
18.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
18.5 Monitor Mode Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .256
18.5.1 Normal Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
18.5.2 Forced Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
18.6 Monitor Mode Vectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
18.7 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
18.8 Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260
18.9 Baud Rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
18.9.1 Force Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
18.9.2 Normal Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
18.10 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
18.11 Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266
18.2 Introduction
This section describes the monitor read-only memory (MON). The
monitor ROM allows complete testing of the microcontroller unit (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 hardware
requirements for in-circuit programming.
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
MOTOROLA
Monitor ROM (MON)
Technical Data
255