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参数资料
型号： ATMEGA6490V-8AI
厂商： Atmel
文件页数： 24/146页
文件大小： 0K
描述： IC AVR MCU FLASH 64K 1.8 100TQFP
产品培训模块： megaAVR Introduction
标准包装： 90
系列： AVR® ATmega
核心处理器： AVR
芯体尺寸： 8-位
速度： 8MHz
连通性： SPI，UART/USART，USI
外围设备： 欠压检测/复位，LCD，POR，PWM，WDT
输入/输出数： 68
程序存储器容量： 64KB（32K x 16）
程序存储器类型： 闪存
EEPROM 大小： 2K x 8
RAM 容量： 4K x 8
电压 - 电源 (Vcc/Vdd)： 1.8 V ~ 5.5 V
数据转换器： A/D 8x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 100-TQFP
包装： 托盘
配用： ATSTK600-TQFP100-ND - STK600 SOCKET/ADAPTER 100-TQFP
ATSTK504-ND - STARTER KIT AVR EXP MOD 100P LCD
PIC16(L)F1825/1829
DS41440C-page 272
2010-2012 Microchip Technology Inc.
25.6
I2C MASTER MODE
Master mode is enabled by setting and clearing the
appropriate SSPM bits in the SSPxCON1 register and
by setting the SSPEN bit. In Master mode, the SDAx
and SCKx pins must be configured as inputs. The
MSSP peripheral hardware will override the output
driver TRIS controls when necessary to drive the pins
low.
Master mode of operation is supported by interrupt
generation on the detection of the Start and Stop
conditions. The Stop (P) and Start (S) bits are cleared
from a Reset or when the MSSPx module is disabled.
Control of the I2C bus may be taken when the P bit is
set, or the bus is Idle.
In Firmware Controlled Master mode, user code
conducts all I2C bus operations based on Start and
Stop bit condition detection. Start and Stop condition
detection is the only active circuitry in this mode. All
other communication is done by the user software
directly manipulating the SDAx and SCLx lines.
The following events will cause the SSPx Interrupt Flag
bit, SSPxIF, to be set (SSPx interrupt, if enabled):
Start condition detected
Stop condition detected
Data transfer byte transmitted/received
Acknowledge transmitted/received
Repeated Start generated
25.6.1
I2C MASTER MODE OPERATION
The master device generates all of the serial clock
pulses and the Start and Stop conditions. A transfer is
ended with a Stop condition or with a Repeated Start
condition. Since the Repeated Start condition is also
the beginning of the next serial transfer, the I2C bus will
not be released.
In Master Transmitter mode, serial data is output
through SDAx, while SCLx outputs the serial clock. The
first byte transmitted contains the slave address of the
receiving device (7 bits) and the Read/Write (R/W) bit.
In this case, the R/W bit will be logic ‘0’. Serial data is
transmitted eight bits at a time. After each byte is
transmitted, an Acknowledge bit is received. Start and
Stop conditions are output to indicate the beginning
and the end of a serial transfer.
In Master Receive mode, the first byte transmitted
contains the slave address of the transmitting device
(7 bits) and the R/W bit. In this case, the R/W bit will be
logic ‘1’. Thus, the first byte transmitted is a 7-bit slave
address followed by a ‘1’ to indicate the receive bit.
Serial data is received via SDAx, while SCLx outputs
the serial clock. Serial data is received eight bits at a
time. After each byte is received, an Acknowledge bit is
transmitted. Start and Stop conditions indicate the
beginning and end of transmission.
A Baud Rate Generator is used to set the clock
frequency output on SCLx. See Section 25.7 “Baud
Rate Generator”
for more detail.
Note 1:
The MSSPx module, when configured in
I2C Master mode, does not allow
queueing of events. For instance, the user
is not allowed to initiate a Start condition
and immediately write the SSPxBUF
register to initiate transmission before the
Start condition is complete. In this case,
the SSPxBUF will not be written to and the
WCOL bit will be set, indicating that a
write to the SSPxBUF did not occur
2:
When
in
Master
mode,
Start/Stop
detection is masked and an interrupt is
generated when the SEN/PEN bit is
cleared and the generation is complete.
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ATmega6490V-8AU 功能描述:8位微控制器 -MCU AVR 64K FLASH 2K EE 4K SRAM ADC LCD RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA6490V-8AUR 功能描述:8位微控制器 -MCU AVR 64KB FLSH 2KB EE 4KB SRAM LCD8MHz1.8V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATmega649-16AI 功能描述:8位微控制器 -MCU AVR 64K FLASH 2K EE 4K SRAM ADC LCD RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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ATMEGA649-16AUR 功能描述:8位微控制器 -MCU AVR 64KB FLSH 2KB EE 4KB SRAM LCD16MHz,5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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