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參數(shù)資料
| 型號(hào)： | MQ80C52TXXX-20:D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44 |
| 封裝： | CERAMIC, QFP-44 |
| 文件頁(yè)數(shù)： | 41/81頁(yè) |
| 文件大小： | 663K |
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46
ATtiny28L/V
1062F–AVR–07/06
Memory
Programming
Program Memory Lock
Bits
The ATtiny28 MCU provides two Lock bits that can be left unprogrammed (“1”) or can be
programmed (“0”) to obtain the additional features listed in Table 20. The Lock bits can
only be erased with the Chip Erase command.
Note:
1. Further programming of the Fuse bits is also disabled. Program the Fuse bits before
programming the Lock bits.
Fuse Bits
The ATtiny28 has five Fuse bits, INTCAP and CKSEL3..0.
When the INTCAP Fuse is programmed (“0”), internal load capacitors are
“Crystal Oscillator” on page 7. Default value is unprogrammed (“1”).
CKSEL3..0 Fuses: See Table 1, “Device Clocking Option Select,” on page 7 and
combination of CKSEL3..0 to use. Default value is “0010”, internal RC oscillator with
long start-up time.
The status of the Fuse bits is not affected by Chip Erase.
Signature Bytes
All Atmel microcontrollers have a 3-byte signature code that identifies the device. The
three bytes reside in a separate address space.
For the ATtiny28, they are:
1.
$000: $1E (indicates manufactured by Atmel)
2.
$001: $91 (indicates 2 KB Flash memory)
3.
$002: $07 (indicates ATtiny28 device when signature byte $001 is $91)
Calibration Byte
The ATtiny28 has one byte calibration value for the internal RC oscillator. This byte
resides in the high byte of address $000 in the signature address space. During memory
programming, the external programmer must read this location, and program it into a
selected location in the the normal Flash program memory. At start-up, the user soft-
ware must read this Flash location and write the value to the OSCCAL register.
Table 20. Lock Bit Protection Modes
Memory Lock Bits
Protection Type
Mode
LB1
LB2
1
No memory lock features enabled.
2
0
1
Further programming of the Flash is disabled.
3
0
Same as mode 2, and verify is also disabled.
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