收藏本站
PIC18FXX39
DS30485A-page 148
Preliminary
2002 Microchip Technology Inc.
16.4.5
GENERAL CALL ADDRESS
SUPPORT
The addressing procedure for the I2C bus is such that,
the first byte after the START condition usually deter-
mines which device will be the slave addressed by the
master. The exception is the general call address,
which can address all devices. When this address is
used, all devices should, in theory, respond with an
Acknowledge.
The general call address is one of eight addresses
reserved for specific purposes by the I2C protocol. It
consists of all ‘0’s with R/W = 0.
The general call address is recognized when the Gen-
eral Call Enable bit (GCEN) is enabled (SSPCON2<7>
set). Following a START bit detect, 8-bits are shifted
into the SSPSR and the address is compared against
the SSPADD. It is also compared to the general call
address and fixed in hardware.
If the general call address matches, the SSPSR is
transferred to the SSPBUF, the BF flag bit is set (eighth
bit), and on the falling edge of the ninth bit (ACK bit),
the SSPIF interrupt flag bit is set.
When the interrupt is serviced, the source for the inter-
rupt can be checked by reading the contents of the
SSPBUF. The value can be used to determine if the
address was device specific or a general call address.
In 10-bit mode, the SSPADD is required to be updated
for the second half of the address to match, and the UA
bit is set (SSPSTAT<1>). If the general call address is
sampled when the GCEN bit is set, while the slave is
configured in 10-bit Address mode, then the second
half of the address is not necessary, the UA bit will not
be set, and the slave will begin receiving data after the
Acknowledge (Figure 16-15).
FIGURE 16-15:
SLAVE MODE GENERAL CALL ADDRESS SEQUENCE
(7 OR 10-BIT ADDRESS MODE)
SDA
SCL
S
SSPIF
BF (SSPSTAT<0>)
SSPOV (SSPCON1<6>)
Cleared in software
SSPBUF is read
R/W = 0
ACK
General Call Address
Address is compared to General Call Address
GCEN (SSPCON2<7>)
Receiving data
ACK
12
3
4
5
6
7
8
9
1
2
3
4
5
67
8
9
D7
D6
D5
D4
D3
D2
D1
D0
after ACK, set interrupt
'0'
'1'
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
PIC18F4539T-I/PT IC MCU FLASH 12KX16 EE AD 44TQFP
PIC18F442T-E/ML IC MCU FLASH 8KX16 EE A/D 44QFN
PIC18LF4539T-I/ML IC MCU FLASH 12KX16 EE A/D 44QFN
PIC18F452T-E/ML IC MCU FLASH 16KX16 A/D 44QFN
PIC18F442-E/ML IC MCU FLASH 8KX16 EE A/D 44QFN
PIC18F2539T-I/SO IC MCU FLASH 12KX16 EE AD 28SOIC
PIC18F4439T-I/PT IC MCU FLASH 6KX16 EE A/D 44TQFP
PIC16LF77T-I/ML IC MCU FLASH 8KX14 A/D 44QFN
相关代理商/技术参数
PIC18F4439T-I/PT 功能描述:8位微控制器 -MCU 12KB 640 RAM 32 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
PIC18F4450-I/ML 功能描述:8位微控制器 -MCU 16KB FL 768 RAM 34 I/O FS-USB 2.0 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
PIC18F4450-I/P 功能描述:8位微控制器 -MCU 16KB FL 768 RAM 34 I/O FS-USB 2.0 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
PIC18F4450-I/PT 功能描述:8位微控制器 -MCU 16KB FL 768 RAM 34 I/O FS-USB 2.0 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
PIC18F4450T-I/ML 功能描述:8位微控制器 -MCU 16KB FL 768 RAM 34 I/O FS-USB 2.0 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
PIC18F4450T-I/PT 功能描述:8位微控制器 -MCU 16KB FL 768 RAM 34 I/O FS-USB 2.0 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
PIC18F4455-BL 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER, FOR FLASHLAB 制造商:POWERLITE SYSTEMS 功能描述:PIC18F445 W/ BOOTLOADER, FOR FLASHLAB; Silicon Manufacturer:Powerlite Systems; Core Architecture:PIC; Kit Contents:Board; Features:Bootloader Programming, RS232 Connector for Boot-Loading and Serial Comms ;RoHS Compliant: Yes
PIC18F4455-I/ML 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 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