Ad va nc e Inform a tion — MC68HC(9)08PT48
Se c tion 18. Monitor ROM (MON)
18.1 Conte nts
18.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .299
18.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .299
18.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300
18.4.1
18.4.2
18.4.3
18.4.4
18.4.5
18.4.6
Entering Monitor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .300
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303
Echoing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303
Break Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .304
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .304
Baud Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .308
18.2 Introd uc tion
This section describes the monitor ROM. The monitor ROM allows
complete testing of the MCU through a single-wire interface with a host
computer.
18.3 Fe a ture s
Features of the monitor ROM include:
• Normal user-mode pin functionality
• One pin dedicated to serial communication between monitor ROM
and host computer
• Standard mark/space non-return-to-zero (NRZ) communication
with host computer
• 4800 baud–28.8 kbaud communication with host computer
• Execution of code in RAM or ROM
MC68HC(9)08PT48 — Rev. 2.0
MOTOROLA
Advance Information
299
Monitor ROM (MON)
FREESCALE [ Freescale ]
