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| 型號(hào)： | ATTINY2313-20SU |
| 廠商： | Atmel |
| 文件頁(yè)數(shù)： | 95/225頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU AVR 2K FLASH 20SOIC |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction tinyAVR Introduction |
| 標(biāo)準(zhǔn)包裝： | 37 |
| 系列： | AVR® ATtiny |
| 核心處理器： | AVR |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 連通性： | SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 18 |
| 程序存儲(chǔ)器容量： | 2KB（1K x 16） |
| 程序存儲(chǔ)器類(lèi)型： | 閃存 |
| EEPROM 大?。?/td> | 128 x 8 |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 612 (CN2011-ZH PDF) |
| 配用： | ATSTK600-DIP40-ND - STK600 SOCKET/ADAPTER 40-PDIP ATAVRDRAGON-ND - KIT DRAGON FLASH MEM AVR ATAVRISP2-ND - PROGRAMMER AVR IN SYSTEM ATJTAGICE2-ND - AVR ON-CHIP D-BUG SYSTEM |
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PIC16F72X/PIC16LF72X
DS41341E-page 184
2009 Microchip Technology Inc.
17.2.7
CLOCK STRETCHING
During any SCL low phase, any device on the I2C bus
may hold the SCL line low and delay, or pause, the
transmission of data. This “stretching” of a transmission
allows devices to slow down communication on the
bus. The SCL line must be constantly sampled by the
master to ensure that all devices on the bus have
released SCL for more data.
Stretching usually occurs after an ACK bit of a
transmission, delaying the first bit of the next byte. The
SSP module hardware automatically stretches for two
conditions:
After a 10-bit address byte is received (update
SSPADD register)
Anytime the CKP bit of the SSPCON register is
cleared by hardware
The module will hold SCL low until the CKP bit is set.
This allows the user slave software to update SSPBUF
with data that may not be readily available. In 10-bit
addressing modes, the SSPADD register must be
updated after receiving the first and second address
bytes. The SSP module will hold the SCL line low until
the SSPADD has a byte written to it. The UA bit of the
SSPSTAT register will be set, along with SSPIF,
indicating an address update is needed.
17.2.8
FIRMWARE MASTER MODE
Master mode of operation is supported in firmware
using interrupt generation on the detection of the Start
and Stop conditions. The Stop (P) and Start (S) bits of
the SSPSTAT register are cleared from a Reset or
when the SSP module is disabled (SSPEN cleared).
The Stop (P) and Start (S) bits will toggle based on the
Start and Stop conditions. Control of the I2C bus may
be taken when the P bit is set or the bus is Idle and both
the S and P bits are clear.
In Firmware Master mode, the SCL and SDA lines are
manipulated by setting/clearing the corresponding TRIS
bit(s). The output level is always low, irrespective of the
value(s) in the corresponding PORT register bit(s).
When transmitting a ‘1’, the TRIS bit must be set (input)
and a ‘0’, the TRIS bit must be clear (output).
The following events will cause the SSP Interrupt Flag
bit, SSPIF, to be set (SSP Interrupt will occur if
enabled):
Start condition
Stop condition
Data transfer byte transmitted/received
Firmware Master Mode of operation can be done with
either the Slave mode Idle (SSPM<3:0> = 1011), or
with either of the Slave modes in which interrupts are
enabled. When both master and slave functionality is
enabled, the software needs to differentiate the
source(s) of the interrupt.
Refer
to
Application
Note
AN554,
“Software
Implementation of I2C Bus Master” (DS00554) for more
information.
17.2.9
MULTI-MASTER MODE
In Multi-Master mode, the interrupt generation on the
detection of the Start and Stop conditions allow the
determination of when the bus is free. The Stop (P) and
Start (S) bits are cleared from a Reset or when the SSP
module is disabled. The Stop (P) and Start (S) bits will
toggle based on the Start and Stop conditions. Control
of the I2C bus may be taken when the P bit of the
SSPSTAT register is set or when the bus is Idle, and
both the S and P bits are clear. When the bus is busy,
enabling the SSP Interrupt will generate the interrupt
when the Stop condition occurs.
In Multi-Master operation, the SDA line must be moni-
tored to see if the signal level is the expected output
level. This check only needs to be done when a high
level is output. If a high level is expected and a low level
is present, the device needs to release the SDA and
SCL lines (set TRIS bits). There are two stages where
this arbitration of the bus can be lost. They are the
Address Transfer and Data Transfer stages.
When the slave logic is enabled, the slave continues to
receive. If arbitration was lost during the address
transfer stage, communication to the device may be in
progress. If addressed, an ACK pulse will be
generated. If arbitration was lost during the data
transfer stage, the device will need to re-transfer the
data at a later time.
Refer to Application Note AN578, “Use of the SSP
Module
in
the
I2C
Multi-Master
Environment”
(DS00578) for more information.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ATTINY2313-20SU SL383 | 制造商:Atmel Corporation 功能描述:MCU 8-Bit ATtiny AVR RISC 2KB Flash 3.3V/5V 20-Pin SOIC W T/R |
| ATTINY2313-20SU SL514 | 制造商:Atmel Corporation 功能描述: |
| ATTINY2313-20SUR | 功能描述:8位微控制器 -MCU AVR 2KB FLSH 128B EE 128B SRAM 1UART 20P 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 |
| ATTINY2313-20SUR SL514 | 制造商:Atmel Corporation 功能描述: |
| ATTINY2313A | 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:8-bit Microcontroller with 2/4K Bytes In-System Programmable Flash |
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