MC68HC908AS60MFN MOTOROLA [Motorola, Inc], MC68HC908AS60MFN Datasheet - Page 192
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MC68HC908AS60MFN
Manufacturer Part Number
MC68HC908AS60MFN
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AS60MFN.pdf
(454 pages)
- Current page: 192 of 454
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Monitor ROM (MON)
13.3 Features
13.4 Functional Description
Technical Data
192
Features of the monitor ROM include:
Monitor ROM receives and executes commands from a host computer.
Figure 13-1
communicate with a host computer via a standard RS-232 interface.
While simple monitor commands can access any memory address, the
MC68HC908AS60 has a FLASH security feature to prevent external
viewing of the contents of FLASH. Proper procedures must be followed
to verify FLASH content. Access to the FLASH 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.
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Freescale Semiconductor, Inc.
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
4800 baud–28.8 Kbaud communication with host computer
Execution of code in RAM or FLASH
FLASH security
FLASH programming
Go to: www.freescale.com
shows a sample circuit used to enter monitor mode and
Monitor ROM (MON)
13.4.7
MC68HC908AS60 — Rev. 1.0
Security).
MOTOROLA
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