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M14C16-WS22 Datasheet(PDF) 7 Page - STMicroelectronics |
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M14C16-WS22 Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 13 page  7/13 M14C16, M14C04 Random Address Read A dummy write is performed to load the address into the address counter, as shown in Figure 8. This is followed by another START condition from the master and the device select is repeated with the RW bit set to ‘1’. The memory acknowledges this, and outputs the byte addressed. The master must not acknowledge the byte output, and termi- nates the transfer with a STOP condition. Sequential Read This mode can be initiated with either a Current Address Read or a Random Address Read. How- ever, in this case the master does acknowledge the data byte output, and the memory continues to output the next byte in sequence. To terminate the stream of bytes, the master must not acknowledge the last byte output, and must generate a STOP condition. The output data comes from consecu- tive addresses, with the internal address counter automatically incremented after each byte output. with an ACK, indicating that the memory is ready to receive the second part of the next in- struction (the first byte of this instruction having been sent during Step 1). Read Operations Read operations are independent of the state of the WC pin. On delivery, the memory content is set at all “1’s” (FFh). Current Address Read The memory has an internal address counter. Each time a byte is read, this counter is increment- ed. For the Current Address Read mode, following a START condition, the master sends a device se- lect with the RW bit set to ‘1’. The memory ac- knowledges this, and outputs the byte addressed by the internal address counter. The counter is then incremented. The master must not acknowl- edge the byte output, and terminates the transfer with a STOP condition, as shown in Figure 8. Figure 7. Write Cycle Polling Flowchart using ACK WRITE Cycle in Progress AI02165 Next Operation is Addressing the Memory START Condition DEVICE SELECT with RW = 0 ACK Returned YES NO YES NO ReSTART STOP Proceed WRITE Operation Proceed Random Address READ Operation Send Byte Address First byte of instruction with RW = 0 already decoded by M14xxx |
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