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PIC12C508A-04/P 参数 Datasheet PDF下载

PIC12C508A-04/P图片预览
型号: PIC12C508A-04/P
PDF下载: 下载PDF文件 查看货源
内容描述: 8引脚, 8位CMOS微控制器 [8-Pin, 8-Bit CMOS Microcontrollers]
分类和应用: 微控制器和处理器外围集成电路光电二极管PC可编程只读存储器时钟
文件页数/大小: 113 页 / 1604 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC12C5XX  
FIGURE 7-3: DATA TRANSFER SEQUENCE ON THE SERIAL BUS  
(A)  
(B)  
(C)  
(D)  
(C)  
(A)  
SCL  
SDA  
START  
CONDITION  
STOP  
CONDITION  
ADDRESS OR  
ACKNOWLEDGE  
VALID  
DATA  
ALLOWED  
TO CHANGE  
FIGURE 7-4: ACKNOWLEDGE TIMING  
Acknowledge  
Bit  
1
2
3
4
5
6
7
8
9
1
2
3
SCL  
SDA  
Data from transmitter  
Data from transmitter  
Receiver must release the SDA line at this point  
so the Transmitter can continue sending data.  
Transmitter must release the SDA line at this point  
allowing the Receiver to pull the SDA line low to  
acknowledge the previous eight bits of data.  
7.2  
Device Addressing  
FIGURE 7-5: CONTROL BYTE FORMAT  
Read/Write Bit  
After generating a START condition, the bus master  
transmits a control byte consisting of a slave address  
and a Read/Write bit that indicates what type of opera-  
tion is to be performed. The slave address consists of  
a 4-bit device code (1010) followed by three don’t care  
bits.  
Device Select  
Don’t Care  
Bits  
Bits  
S
1
0
1
0
X
X
X R/W ACK  
The last bit of the control byte determines the operation  
to be performed. When set to a one a read operation is  
selected, and when set to a zero a write operation is  
selected. (Figure 7-5). The bus is monitored for its cor-  
responding slave address all the time. It generates an  
acknowledge bit if the slave address was true and it is  
not in a programming mode.  
Slave Address  
Start Bit  
Acknowledge Bit  
DS40139E-page 32  
1999 Microchip Technology Inc.  
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