HI，在运行测试时将PICIT 3从PIC12断开。I2C通信依赖于电阻上拉，为I2C时钟和数据线建立高电平信号。PIKIT 3在ICSP时钟和数据线上有电阻下拉，4.7 KOHM。这个8引脚器件具有I2C和编程工具共享。相同的时钟引脚。通过拾取3连接，上拉和下拉电阻形成一个分压器，给出1.1个电压。I2C是一个“先听后说”的协议，因此当时钟引脚上没有合适的高逻辑电平时，I2C硬件将拒绝信号启动条件。迈西尔
以上来自于百度翻译
以下为原文
Hi,
Disconnect the PICkit 3 from PIC12 when running your test.
I2C communication depend on resistive pull-up to establish High level signal for I2C Clock and Data lines.
PICkit 3 have resistive pull-down on ICSP Clock and Data lines, 4.7 kOhm.
This 8 pin device have I2C and Programming tool sharing the same clock pin.
With PICkit 3 connected, pull-up and pull-down resistors form a voltage divider giving 1.1 Volt.
I2C is a 'listen before you talk' protocol, so when there is not a proper high logic level on the clock pin,
I2C hardware will refuse to signal Start condition.
Mysil
HI，在运行测试时将PICIT 3从PIC12断开。I2C通信依赖于电阻上拉，为I2C时钟和数据线建立高电平信号。PIKIT 3在ICSP时钟和数据线上有电阻下拉，4.7 KOHM。这个8引脚器件具有I2C和编程工具共享。相同的时钟引脚。通过拾取3连接，上拉和下拉电阻形成一个分压器，给出1.1个电压。I2C是一个“先听后说”的协议，因此当时钟引脚上没有合适的高逻辑电平时，I2C硬件将拒绝信号启动条件。迈西尔
以上来自于百度翻译
以下为原文
Hi,
Disconnect the PICkit 3 from PIC12 when running your test.
I2C communication depend on resistive pull-up to establish High level signal for I2C Clock and Data lines.
PICkit 3 have resistive pull-down on ICSP Clock and Data lines, 4.7 kOhm.
This 8 pin device have I2C and Programming tool sharing the same clock pin.
With PICkit 3 connected, pull-up and pull-down resistors form a voltage divider giving 1.1 Volt.
I2C is a 'listen before you talk' protocol, so when there is not a proper high logic level on the clock pin,
I2C hardware will refuse to signal Start condition.
Mysil
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