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參數(shù)資料
| 型號(hào)： | MQ80C32-16SC |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 16 MHz, MICROCONTROLLER, CQFP44 |
| 文件頁(yè)數(shù)： | 46/189頁(yè) |
| 文件大小： | 22337K |
| 代理商： | MQ80C32-16SC |
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14
XMEGA C4 [DATASHEET]
8493G–AVR–01/2014
The production signature row also contains an ID that identifies each microcontroller device type and a serial number for
each manufactured device. The serial number consists of the production lot number, wafer number, and wafer
coordinates for the device. The device ID for the available devices is shown in Table 7-1.
The production signature row cannot be written or erased, but it can be read from application software and external
programmers.
Table 7-1.
Device ID bytes.
7.3.5
User Signature Row
The user signature row is a separate memory section that is fully accessible (read and write) from application software
and external programmers. It is one flash page in size, and is meant for static user parameter storage, such as calibration
data, custom serial number, identification numbers, random number seeds, etc. This section is not erased by chip erase
commands that erase the flash, and requires a dedicated erase command. This ensures parameter storage during
multiple program/erase operations and on-chip debug sessions.
7.4
Fuses and Lock bits
The fuses are used to configure important system functions, and can only be written from an external programmer. The
application software can read the fuses. The fuses are used to configure reset sources such as brownout detector and
watchdog, and startup configuration.
The lock bits are used to set protection levels for the different flash sections (that is, if read and/or write access should be
blocked). Lock bits can be written by external programmers and application software, but only to stricter protection levels.
Chip erase is the only way to erase the lock bits. To ensure that flash contents are protected even during chip erase, the
lock bits are erased after the rest of the flash memory has been erased.
An unprogrammed fuse or lock bit will have the value one, while a programmed fuse or lock bit will have the value zero.
Both fuses and lock bits are reprogrammable like the flash program memory.
Device
Device ID bytes
Byte 2
Byte 1
Byte 0
ATxmega16C4
43
94
1E
ATxmega32C4
44
95
1E
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