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MC68HC705P9CS bảng dữ liệu(PDF) 37 Page - Freescale Semiconductor, Inc

tên linh kiện MC68HC705P9CS
Giải thích chi tiết về linh kiện  Microcontrollers
PDF  160 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS bảng dữ liệu(HTML) 37 Page - Freescale Semiconductor, Inc

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Memory
EPROM/OTPROM
MC68HC705P9 — Rev. 4.0
Technical Data
MOTOROLA
Memory
37
3.6 EPROM/OTPROM
An MCU with a quartz window has 2104 bytes of erasable,
programmable ROM (EPROM). The quartz window allows EPROM
erasure with ultraviolet light.
NOTE:
Keep the quartz window covered with an opaque material except when
programming the MCU. Ambient light may affect MCU operation.
In an MCU without the quartz window, the EPROM cannot be erased
and serves as 2104 bytes of one-time programmable ROM (OTPROM).
The following addresses are user EPROM/OTPROM locations:
•
$0020–$004F
•
$0100–$08FF
•
$1FF8–$1FFF (reserved for user-defined interrupt and reset
vectors)
The mask option register (MOR) is an EPROM/OTPROM location at
address $0900.
3.6.1 EPROM/OTPROM Programming
The two ways to program the EPROM/OTPROM are:
•
Manipulating the control bits in the EPROM programming register
to program the EPROM/OTPROM on a byte-by-byte basis
•
Activating the bootloader ROM to download the contents of an
external memory device to the on-chip EPROM/OTPROM
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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