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參數(shù)資料
| 型號(hào)： | ATTINY2313 |
| 廠商： | Atmel Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| 中文描述： | 位AVR微控制器具有8K字節(jié)的系統(tǒng)內(nèi)可編程閃存 |
| 文件頁(yè)數(shù)： | 51/226頁(yè) |
| 文件大小： | 3676K |
| 代理商： | ATTINY2313 |
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144
2543L–AVR–08/10
ATtiny2313
Start Condition
Detector
The start condition detector is shown in Figure 65. The SDA line is delayed (in the range of 50 to
300 ns) to ensure valid sampling of the SCL line.
The start condition detector is working asynchronously and can therefore wake up the processor
from the Power-down sleep mode. However, the protocol used might have restrictions on the
SCL hold time. Therefore, when using this feature in this case the Oscillator start-up time set by
the CKSEL Fuses (see “Clock Systems and their Distribution” on page 22) must also be taken
into the consideration.
Alternative USI
Usage
When the USI unit is not used for serial communication, it can be set up to do alternative tasks
due to its flexible design.
Half-duplex
Asynchronous Data
Transfer
By utilizing the Shift Register in Three-wire mode, it is possible to implement a more compact
and higher performance UART than by software only.
4-bit Counter
The 4-bit counter can be used as a stand-alone counter with overflow interrupt. Note that if the
counter is clocked externally, both clock edges will generate an increment.
12-bit Timer/Counter
Combining the USI 4-bit counter and Timer/Counter0 allows them to be used as a 12-bit
counter.
Edge Triggered
External Interrupt
By setting the counter to maximum value (F) it can function as an additional external interrupt.
The overflow flag and interrupt enable bit are then used for the external interrupt. This feature is
selected by the USICS1 bit.
Software Interrupt
The counter overflow interrupt can be used as a software interrupt triggered by a clock strobe.
USI Register
Descriptions
USI Data Register –
USIDR
The USI uses no buffering of the serial register, i.e., when accessing the Data Register (USIDR)
the serial register is accessed directly. If a serial clock occurs at the same cycle the register is
written, the register will contain the value written and no shift is performed. A (left) shift operation
is performed depending of the USICS1..0 bits setting. The shift operation can be controlled by
an external clock edge, by a Timer/Counter0 overflow, or directly by software using the USICLK
strobe bit. Note that even when no wire mode is selected (USIWM1..0 = 0) both the external
data input (DI/SDA) and the external clock input (USCK/SCL) can still be used by the Shift
Register.
The output pin in use, DO or SDA depending on the wire mode, is connected via the output latch
to the most significant bit (bit 7) of the Data Register. The output latch is open (transparent) dur-
ing the first half of a serial clock cycle when an external clock source is selected (USICS1 = 1),
and constantly open when an internal clock source is used (USICS1 = 0). The output will be
changed immediately when a new MSB written as long as the latch is open. The latch ensures
that data input is sampled and data output is changed on opposite clock edges.
Note that the corresponding Data Direction Register to the pin must be set to one for enabling
data output from the Shift Register.
Bit
7
6
5
4
3
2
1
0
MSB
LSB
USIDR
Read/Write
R/W
Initial Value
0
相關(guān)PDF資料 |
PDF描述 |
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| ATMEGA128 | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| AT93C56AU3-10UI-1.8 | 3-wire Serial EEPROMs 2K (256 x 8 or 128 x 16) |
| AT93C56AU3-10UI-2.7 | 3-wire Serial EEPROMs 2K (256 x 8 or 128 x 16) |
| AT93C56AW-10SI-1.8 | 3-wire Serial EEPROMs 2K (256 x 8 or 128 x 16) |
| AT93C56AW-10SI-2.7 | 3-wire Serial EEPROMs 2K (256 x 8 or 128 x 16) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ATTINY2313_06 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 2K Bytes In-System Programmable Flash |
| ATTINY2313-16MI | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash |
| ATTINY2313-16MJ | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash |
| ATTINY2313-16PI | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash |
| ATTINY2313-16PJ | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash |
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