mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 142

• Manufacturer Part Number: mc68hc08az60
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

Monitor ROM (MON)
Features
Functional Description
MC68HC08AZ60 — Rev 1.0
142
Features of the monitor ROM include:
Monitor ROM receives and executes commands from a host computer.
Figure 1
communicate with a host computer via a standard RS-232 interface.
While simple monitor commands can access any memory address, the
MC68HC08AZ60 has a ROM security feature to prevent external
viewing of the contents of ROM. Proper procedures must be followed to
verify ROM content. Access to the ROM is denied to unauthorized users
of customer specified software (see
In monitor mode, the MCU can execute host-computer code in RAM
while all MCU pins except PTA0 retain normal operating mode functions.
All communication between the host computer and the MCU is through
the PTA0 pin. A level-shifting and multiplexing interface is required
between PTA0 and the host computer. PTA0 is used in a wired-OR
configuration and requires a pullup resistor.
Freescale Semiconductor, Inc.
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For More Information On This Product,
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
Up to 28.8 kBaud Communication with Host Computer
Execution of Code in RAM.
shows a sample circuit used to enter monitor mode and
Go to: www.freescale.com
Monitor ROM (MON)
Security
on page 151).
MOTOROLA
2-mon