Datasheet 搜索 > 16位微控制器 > NXP（恩智浦） > MC9S12A256CPVE 数据手册 > MC9S12A256CPVE 用户编程技术手册 5/60 页
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MC9S12A256CPVE 用户编程技术手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
16位微控制器
封装:
LQFP-112
描述:
NXP MC9S12A256CPVE 微控制器, 16位, S12A, 25 MHz, 256 KB, 12 KB, 112 引脚, LQFP
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MC9S12A256CPVE数据手册
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Application Note
Overview of the MC9S12DP256’s FLASH
AN2153
5
Figure 2. FLASH Status and Control Registers
FLASH Protection The protected areas of each FLASH block are controlled by four bytes
of FLASH memory residing in the fixed page memory area from
$FF0A–$FF0D. During the microcontroller reset sequence, each of the
four banked FLASH protection registers (FPROT) is loaded from values
programmed into these memory locations. As shown in Figure 3,
location $FF0A controls protection for block three, $FF0B controls
protection for block two, $FF0C controls protection for block one, and
$FF0D controls protection for block zero.
The values loaded into each FPROT register determine whether the
entire block or just subsections are protected from being accidentally
erased or programmed. As mentioned previously, each 64-K block can
have two protected areas. One of these areas, known as the lower
protected block, grows from the middle of the 64-K block upward. The
other, known as the upper protected block, grows from the top of the
64-K block downward. In general, the upper protected area of FLASH
block zero is used to hold bootloader code since it contains the reset and
interrupt vectors. The lower protected area of block zero and the
protected areas of the other FLASH blocks can be used for critical
parameters that would not change when program firmware was updated.
Bit 7 6 5 4 3 2 1 Bit 0
FCLKDIV FDIVLD PRDIV8 FDIV5 FDIV4 FDIV3 FDIV2 FDIV1 FDIV0 $x100
FSEC KEYEN NV6 NV5 NV4 NV3 NV2 SEC01 SEC00 $x101
Reserved 0 0 0 0 0 0 0 0 $x102
FCNFG CBEIE CCIE KEYACC 0 0 0 BKSEL1 BKSEL1 $X103
Unbanked
Banked
FPROT FPOPEN F FPHDIS FPHS1 FPHS0 FPLDIS FPLS1 FPLS0 $X104
FSTAT CBEIF CCIF PVIOL ACCERR 0 BLANK 0 0 $X105
FCMD 0 ERASE PROG 0 0 ERVER 0 MASS $X106
Reserved 0 0 0 0 0 0 0 0
$X107–
$x10F
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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