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ST52F510 Datasheet(PDF) 33 Page - STMicroelectronics |
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ST52F510 Datasheet(HTML) 33 Page - STMicroelectronics |
33 / 106 page ST52F510/F513/F514 33/106 Figure 4.1 Commands and Data Communication Sequences The generic procedure of commands execution, with the data communication in both directions is displayed in Figure 4.1. Remark: the Slave Address 1010000 must be sent after a Stop (i.e. each time the data direction changes, to specify the R/W bit). For example: if a command to send data to the device has been executed, a command for receiving data must be followed by the slave address and the R/W bit must be set to 1. The Programming Mode code doesn’t need to be specified again . Warning: After entering the Programming Mode, the currently pointed address is the Page 48, Block 3, byte 0 (Lock Byte). The list of the available commands in Programming Mode is showed in Table 4.2 4.2.2 Fast Programming procedure. The fastest way to program the device memory is the use of the FastBlockWrite command. The following procedure can be used to write the memory with a new program and new data, starting from the first memory location: 1. The Programming Mode is entered with the sequence described above 2. The memory is erased (all bits are put to 0) with the GlobalErase command. The device holds the SCL line low, releasing it after the command is completed (about 2 ms). This command also unlocks the device if locked. 3. The FastBlockWrite command is sent and the device acknowledges it 4. The 32 bytes of data to be written in the first memory Block are sent in a sequence. The device acknowledges each of them 5. After the device acknowledges the 32nd byte, it holds the SCL line until the parallel writing of the 32 byte is completed (about 2.5 ms) 6. The Block Pointer is incremented by sending the IncBlock command 7. The procedure is repeated from point 3 until there is data to be sent to the memory Note: the Block Pointer assumes values between 0 to 7 (there are 8 blocks in a page). When the Block Pointer is equal to 7, the IncBlock command puts this pointer to 0 and increments the Page Pointer. The Page Pointer, after page writing is completed, does’t have to be incremented in the procedure above described. 4.2.3 Random data writing. A single byte can be written in a specified memory location by using the following procedure: 1. The Programming Mode is entered with the sequence described in Section 4.2.1 2. The SetPage command is sent, followed by the page number where the data should be written 3. The ByteWrite command is sent followed by two bytes 4. The first bytes that follows the ByteWrite com- mand is the address inside the pointed page where the data must be written. 5. The second byte is the data to be written 6. The device held the SCL line low until the data is not stored in the memory (about 4.5 ms: 2 ms for erasing and 2.5 for writing) Programming mode start sequence Execution of commands for writing data: Execution of commands for reading data: S=Start, P=Stop, A=Acknowledge, NA=Non-acknowledge From Slave to Master From Master to Slave S 10100000 A 00000000 A Command A Data1 A ..... DataN AP Command A Data1 A ..... DataN A Command A Data1 A ..... DataN AP Command A Address A P S 10100001 A Data read NA P |
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