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TCA6408APWR датащи(PDF) 11 Page - Texas Instruments |
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TCA6408APWR датащи(HTML) 11 Page - Texas Instruments |
11 / 35 page Reads 0 0 1 S 0 0 0 AD DR 0 A A Data from Register Slave Address Slave Address R/W ACK From Slave Command Byte S 0 0 1 0 0 0 R/W 1 A Data A Data Data from Register NA P Last Byte At this moment, master-transmitter becomes master-receiver, and slave-receiver becomes slave-transmitter ACK From Slave ACK From Slave ACK From Master NACK From Master First byte AD DR SCL SDA INT Start Condition R/W ReadFrom Port DataInto Port Stop Condition ACKFrom Master NACKFrom Master ACKFrom Slave DataFromPort Slave Address DataFromPort 1 9 R 7 6 5 4 3 2 0 0 1 S 0 0 0 AD DR 1 A Data1 Data4 A NA P Data2 Data3 Data4 Data5 INT iscleared byReadfromPort Stopnotneeded toclear INT tph tps tir tiv TCA6408A www.ti.com ............................................................................................................................................................. SCPS192C–APRIL 2009–REVISED JULY 2009 The bus master first must send the TCA6408A address with the LSB set to a logic 0 (see Figure 4 for device address). The command byte is sent after the address and determines which register is accessed. After a restart, the device address is sent again but, this time, the LSB is set to a logic 1. Data from the register defined by the command byte then is sent by the TCA6408A (see Figure 8 and Figure 9). Data is clocked into the register on the rising edge of the ACK clock pulse. Figure 8. Read From Register <br/> A. Transfer of data can be stopped at any time by a Stop condition. When this occurs, data present at the latest acknowledge phase is valid (output mode). It is assumed that the command byte previously has been set to 00 (read Input Port Register). B. This figure eliminates the command byte transfer, a restart, and slave address call between the initial slave address call and actual data transfer from P port (see Figure 8). Figure 9. Read From Input Port Register Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TCA6408A |
Аналогичный номер детали - TCA6408APWR |
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Аналогичное описание - TCA6408APWR |
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