参数资料
型号: MC68HC11ED0VP2
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PDIP40
封装: PLASTIC, DIP-40
文件页数: 48/108页
文件大小: 1672K
代理商: MC68HC11ED0VP2
Technical Summary
MC68HC11ED0 — Rev. 1.0
Operating Modes and On-Chip Memory
Operating Modes and On-Chip Memory
4.3 Operating Modes
This subsection describes the three memory modes:
Bootstrap mode
Special test mode
Expanded operating mode
Refer to Figure 4-3.
4.3.1 Bootstrap Mode
Bootstrap mode allows special-purpose programs to be entered into
internal random-access memory (RAM). The MCU contains 256 bytes of
bootstrap ROM which is enabled and present in the memory map only
when the device is in bootstrap mode. The bootstrap ROM contains a
small program which initializes the serial communications interface (SCI)
and allows the user to download exactly 256 bytes of code into on-chip
RAM. After receiving the character for address $01FF, control passes to
the loaded program at $0100. Vectors are present on chip and located
at $BFC0–$BFFF.
4.3.2 Special Test Mode
Special test mode is used primarily for factory testing. In this operating
mode, vectors must be provided externally at $BFC0–$BFFF.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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