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參數(shù)資料
| 型號(hào)： | IF280C52EXXX-L16SHXXX |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| 文件頁(yè)數(shù)： | 43/210頁(yè) |
| 文件大小： | 5175K |
| 代理商： | IF280C52EXXX-L16SHXXX |
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137
8048C–AVR–02/12
ATtiny43U
18.5
EEPROM Write Prevents Writing to SPMCSR
Note that an EEPROM write operation will block all software programming to Flash. Reading the
Fuses and Lock bits from software will also be prevented during the EEPROM write operation. It
is recommended that the user checks the status bit (EEPE) in the EECR Register and verifies
that the bit is cleared before writing to the SPMCSR Register.
18.6
Reading the Fuse and Lock Bits from Software
It is possible for firmware to read device fuse and lock bits. In addition, firmware can also read
data from the device signature imprint table (see page 143).
Note:
Fuse and Lock bits that are programmed, will be read as zero. Fuse and Lock bits that are unpro-
grammed, will be read as one.
18.6.1
Reading Lock Bits from Firmware
Lock bit values are returned in the destination register after an LPM instruction has been issued
within three CPU cycles after RFLB and SPMEN bits have been set in SPMCSR. The RFLB and
SPMEN bits automatically clear upon completion of reading the lock bits, or if no LPM instruction
is executed within three CPU cycles, or if no SPM instruction is executed within four CPU cycles.
When RFLB and SPMEN are cleared LPM functions normally.
To read the lock bits, follow the below procedure:
1.
Load the Z-pointer with 0x0001.
2.
Set RFLB and SPMEN bits in SPMCSR.
3.
Issue an LPM instruction within three clock cycles.
4.
Read the lock bits from the LPM destination register.
If successful, the contents of the destination register are as follows.
See section “Program And Data Memory Lock Bits” on page 141 for more information.
18.6.2
Reading Fuse Bits from Firmware
The algorithm for reading fuse bytes is similar to the one described above for reading lock bits,
only the addresses are different. To read the Fuse Low Byte (FLB), follow the below procedure:
1.
Load the Z-pointer with 0x0000.
2.
Set RFLB and SPMEN bits in SPMCSR.
3.
Issue an LPM instruction within three clock cycles.
4.
Read the FLB from the LPM destination register.
If successful, the contents of the destination register are as follows.
Refer to Table 19-5 on page 143 for a detailed description and mapping of the Fuse Low Byte.
Bit
7
654321
0
Rd
–
–––––
LB2
LB1
Bit
7
6
543
2
1
0
Rd
FLB7
FLB6
FLB5
FLB4
FLB3
FLB2
FLB1
FLB0
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|---|---|
| MD80C32-30 | 8-BIT, 30 MHz, MICROCONTROLLER, CDIP40 |
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| MR87C51FB-16 | 8-BIT, UVPROM, 16 MHz, MICROCONTROLLER, CQCC44 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IF280C52-L16 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-Bit Microcontroller |
| IF280C52T-12 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-Bit Microcontroller |
| IF280C52T-16 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-Bit Microcontroller |
| IF280C52T-20 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-Bit Microcontroller |
| IF280C52T-25 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:8-Bit Microcontroller |
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