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參數(shù)資料
| 型號： | IT83C154TXXX-36D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 36 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 1 MM HEIGHT, TQFP-44 |
| 文件頁數(shù)： | 62/210頁 |
| 文件大?。?/td> | 5175K |
| 代理商： | IT83C154TXXX-36D |
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154
8048C–AVR–02/12
ATtiny43U
When programming the EEPROM, an auto-erase cycle is built into the self-timed programming
operation (in the Serial mode ONLY) and there is no need to first execute the Chip Erase
instruction. The Chip Erase operation turns the content of every memory location in both the
Program and EEPROM arrays into 0xFF.
Depending on CKSEL Fuses, a valid clock must be present. The minimum low and high periods
for the serial clock (SCK) input are defined as follows:
Low:> 2 CPU clock cycles for f
ck < 12 MHz, 3 CPU clock cycles for fck >= 12 MHz
High:> 2 CPU clock cycles for f
ck < 12 MHz, 3 CPU clock cycles for fck >= 12 MHz
19.7.1
Serial Programming Algorithm
When writing serial data to the ATtiny43U, data is clocked on the rising edge of SCK.
When reading data from the ATtiny43U, data is clocked on the falling edge of SCK. See Figure
20-8 and Figure 20-9 for timing details.
To program and verify the ATtiny43U in the Serial Programming mode, the following sequence
is recommended (see four byte instruction formats in Table 19-16):
1.
Power-up sequence:
Apply power between V
CC and GND while RESET and SCK are set to “0”. In some sys-
tems, the programmer can not guarantee that SCK is held low during power-up. In this
case, RESET must be given a positive pulse of at least two CPU clock cycles duration
after SCK has been set to “0”. The duration of the pulse must be at least t
RST plus two
CPU clock cycles. See Table 20-4 on page 161 for definition of minimum pulse width
on RESET pin, t
RST
2.
Wait for at least 20 ms and enable serial programming by sending the Programming
Enable serial instruction to pin MOSI.
3.
The serial programming instructions will not work if the communication is out of syn-
chronization. When in sync. the second byte (0x53), will echo back when issuing the
third byte of the Programming Enable instruction. Whether the echo is correct or not, all
four bytes of the instruction must be transmitted. If the 0x53 did not echo back, give
RESET a positive pulse and issue a new Programming Enable command.
4.
The Flash is programmed one page at a time. The memory page is loaded one byte at
a time by supplying the 5 LSB of the address and data together with the Load Program
memory Page instruction. To ensure correct loading of the page, the data low byte must
be loaded before data high byte is applied for a given address. The Program memory
Page is stored by loading the Write Program memory Page instruction with the 3 MSB
of the address. If polling (RDY/BSY) is not used, the user must wait at least t
WD_FLASH
before issuing the next page. (See Table 19-15 on page 155.) Accessing the serial pro-
gramming interface before the Flash write operation completes can result in incorrect
programming.
5.
A: The EEPROM array is programmed one byte at a time by supplying the address and
data together with the appropriate Write instruction. An EEPROM memory location is
first automatically erased before new data is written. If polling (RDY/BSY) is not used,
the user must wait at least t
WD_EEPROM before issuing the next byte. (See Table 19-15
on page 155.) In a chip erased device, no 0xFFs in the data file(s) need to be pro-
grammed.
B: The EEPROM array is programmed one page at a time. The Memory page is loaded
one byte at a time by supplying the 2 LSB of the address and data together with the
Load EEPROM Memory Page instruction. The EEPROM Memory Page is stored by
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| IT84B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIAC|400V V(DRM)|8A I(T)RMS|TO-220 |
| IT84C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIAC|400V V(DRM)|8A I(T)RMS|TO-220 |
| IT84F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIAC|400V V(DRM)|8A I(T)RMS|TO-220 |
| IT84G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIAC|400V V(DRM)|8A I(T)RMS|TO-220 |
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