參數(shù)資料
型號: MC68HC705C9ACFN
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: Microcontrollers
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 41/160頁
文件大小: 2076K
代理商: MC68HC705C9ACFN
Memory
EPROM Security
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
Memory
41
2.5 EPROM Security
A security feature has been incorporated into the MC68HC705C9A to
help prevent external access to the contents of the EPROM in any mode
of operation. Once enabled, this feature can be disabled only by
completely erasing the EPROM.
NOTE:
For OTP (plastic) packages, once the security feature has been enabled,
it cannot be disabled.
2.6 ROM
The bootloader ROM occupies 239 bytes in the memory space from
$3F00 to $3FEF. The bootloader mode provides for self-programming of
the EPROM array. See
Appendix A. EPROM Programming
.
2.7 I/O Registers
Except for the option register, mask option registers, and the C12 COP
clear register, all I/O, control and status registers are located within one
32-byte block in page zero of the address space ($0000–$001F). A
summary of these registers is shown in
Figure 2-3
. More detail about the
contents of these registers is given
Figure 2-4
.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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