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| 型號(hào)： | AT90USB1286 |
| 廠商： | Atmel Corp. |
| 英文描述： | 8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller |
| 中文描述： | 8位64/128K的ISP字節(jié)閃存和控制器的USB微控制器 |
| 文件頁(yè)數(shù)： | 33/132頁(yè) |
| 文件大?。?/td> | 10886K |
| 代理商： | AT90USB1286 |
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200
ATmega8535(L)
2502K–AVR–10/06
Figure 93. Formats and States in the Slave Transmitter Mode
Miscellaneous States
There are two status codes that do not correspond to a defined TWI state, see Table 79.
Status 0xF8 indicates that no relevant information is available because the TWINT Flag
is not set. This occurs between other states, and when the TWI is not involved in a serial
transfer.
Status 0x00 indicates that a bus error has occurred during a Two-wire Serial Bus trans-
fer. A bus error occurs when a START or STOP condition occurs at an illegal position in
the format frame. Examples of such illegal positions are during the serial transfer of an
address byte, a data byte, or an acknowledge bit. When a bus error occurs, TWINT is
set. To recover from a bus error, the TWSTO Flag must set and TWINT must be cleared
by writing a logic one to it. This causes the TWI to enter the not addressed Slave mode
and to clear the TWSTO Flag (no other bits in TWCR are affected). The SDA and SCL
lines are released, and no STOP condition is transmitted.
S
SLA
R
A
DATA
A
$A8
$B8
A
$B0
Reception of the own
slave address and one or
more data bytes
Last data byte transmitted.
Switched to not addressed
slave (TWEA = '0')
Arbitration lost as master
and addressed as slave
n
From master to slave
From slave to master
Any number of data bytes
and their associated acknowledge bits
This number (contained in TWSR) corresponds
to a defined state of the Two-wire Serial Bus. The
prescaler bits are zero or masked to zero
P or S
DATA
$C0
DATA
A
$C8
P or S
All 1's
A
Table 79. Miscellaneous States
Status Code
(TWSR)
Prescaler Bits
are 0
Status of the Two-wire Serial
Bus and Two-wire Serial Inter-
face Hardware
Application Software Response
Next Action Taken by TWI Hardware
To/from TWDR
To TWCR
STA
STO
TWINT
TWEA
0xF8
No relevant state information
available; TWINT = “0”
No TWDR action
No TWCR Action
Wait or proceed current transfer
0x00
Bus error due to an illegal
START or STOP condition
No TWDR action
0
1
X
Only the internal hardware is affected, no STOP condi-
tion is sent on the bus. In all cases, the bus is released
and TWSTO is cleared.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT90USB1286-16AU | 制造商:Atmel Corporation 功能描述:8BIT MCU 128K FLASH USB TQFP64 |
| AT90USB1286-16MU | 功能描述:8位微控制器 -MCU 128kB Flash 4kB EEPROM 48 I/O Pins RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| AT90USB1286-AU | 功能描述:8位微控制器 -MCU USB 128K FLASH 16 MHz RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| AT90USB1286-AUR | 功能描述:8位微控制器 -MCU USB 128K FLASH 16 MHz RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| AT90USB1286-MU | 功能描述:8位微控制器 -MCU AVR USB 128K FLASH 16MHz Ind Temp RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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