收藏本站
2009 Microchip Technology Inc.
DS80302F-page 7
PIC16F88X
6.
Module: MSSP (I2C Master Mode)
When the MSSP is I2C Master mode with a
slave device stretching the clock, the clock
generation does not function as described in the
data sheet.
When a slave device is performing clock stretching
by pulling the SCL line low, the master device
should continuously sample the SCL line to
determine when all slaves have released SCL.
When SCL is released, the master device should
wait one BRG period to ensure a constant SCL
high time.
The current implementation does not ensure
accurate SCL high time. During clock stretch, the
MSSP device will erroneously continue running
the BRG counter. At the end of the clock stretch
the BRG counter continues to count down for the
remainder of the BRG period, and then the MSSP
device will immediately resume transmitting the
data.
Figure 1 illustrates an expected I2C transmission
in which the SCL line is completely controlled by
the master device and the slave device does not
attempt to stretch the clock period.
Figure 2 illustrates the expected operation of an
I2C transmission in which the slave device has
stretched the clock period by holding the SCL line
low. The high time of the SCL pulse is constant,
regardless of the duration of the clock stretch.
Figure 3 and Figure 4 illustrate an actual I2C
transmission in which the slave has stretched the
clock period by holding the SCL line low. Note that
the high time of the SCL signal has shortened from
the expected time.
FIGURE 1:
ACTUAL (CORRECT) OPERATION WITHOUT CLOCK STRETCHING
FIGURE 2:
EXPECTED OPERATION WITH CLOCK STRETCHING
BRG Period
SDA
SCL
Master
Slave
BRG Period
SDA
SCL
Master
Slave
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
PIC16F87T-E/SS IC MCU FLASH 4KX14 EEPROM 20SSOP
PIC16F87T-I/ML IC MCU FLASH 4KX14 EEPROM 28QFN
PIC16F87T-E/ML IC MCU FLASH 4KX14 EEPROM 28QFN
PIC16F87-E/ML IC MCU FLASH 4KX14 EEPROM 28QFN
PIC18LF4320-I/ML IC MCU FLASH 4KX16 EEPROM 44QFN
PIC16F77T-I/PTG IC MCU FLASH 8KX14 W/AD 44TQFP
PIC16LF1933-I/SO IC PIC MCU FLASH 4K 28-SOIC
PIC16C54C-20I/SO IC MCU OTP 512X12 18SOIC
相关代理商/技术参数
PIC16F882-I/SO 制造商:Microchip Technology Inc 功能描述:MCU 8BIT 3.5K FLASHSMDSOIC28 ((NW))
PIC16F882-I/SP 功能描述:8位微控制器 -MCU 3.5KB Enhanced Flash 128 RAM 25 I/O 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
PIC16F882-I/SS 功能描述:8位微控制器 -MCU 3.5KB ENHANCED FLASH 128 RAM 25 I/O 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
PIC16F882T-I/ML 功能描述:8位微控制器 -MCU 3.5KB Enh FLSH 128 RAM 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
PIC16F882T-I/SO 功能描述:8位微控制器 -MCU 3.5KB Enh FLSH 128 RAM 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
PIC16F882T-I/SS 功能描述:8位微控制器 -MCU 3.5KB Enh FLSH 128 RAM 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
PIC16F883-E/ML 功能描述:8位微控制器 -MCU 7KB Flash 256 RAM 25 I/O 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
PIC16F883-E/SO 功能描述:8位微控制器 -MCU 7KB Flash 256 RAM 25 I/O 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