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| 型號(hào)： | MR80C32-20/883:RD |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁(yè)數(shù)： | 47/81頁(yè) |
| 文件大小： | 663K |
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51
ATtiny28L/V
1062F–AVR–07/06
Reading the Fuse and Lock
Bits
The algorithm for reading the Fuse and Lock bits is as follows (refer to “Programming
the Flash” for details on command loading):
A: Load Command “0000 0100”.
1.
Set OE to “0”, and BS to “0”. The status of the Fuse bits can now be read at
DATA (“0” means programmed).
Bit 4 = INTCAP Fuse
Bit 3 = CKSEL3 Fuse
Bit 2 = CKSEL2 Fuse
Bit 1 = CKSEL1 Fuse
Bit 0 = CKSEL0 Fuse
2.
Set BS to “1”. The status of the Lock bits can now be read at DATA (“0” means
programmed).
Bit 2: Lock Bit2
Bit 1: Lock Bit1
3.
Set OE to “1”.
Reading the Signature Bytes
and Calibration Byte
The algorithm for reading the signature bytes and the calibration byte is as follows (refer
to “Programming the Flash” for details on command and address loading):
A: Load Command “0000 1000”.
C: Load Address Low Byte ($00 - $02).
1.
Set OE to “0”, and BS to “0”. The selected signature byte can now be read at
DATA.
C: Load Address Low Byte ($00).
1.
Set OE to “0”, and BS to “1”. The calibration byte can now be read at DATA.
2.
Set OE to “1”.
Figure 38. Programming the Flash Waveforms
$10
ADDR. HIGH
ADDR. LOW
DATA LOW
DATA
XA1
XA0
BS
XTAL1
WR
RDY/BSY
RESET
OE
12V
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