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YWW7640 数据表(PDF) 4 Page - IC MICROSYSTEMS |
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YWW7640 数据表(HTML) 4 Page - IC MICROSYSTEMS |
4 / 14 page X76F400 Characteristics subject to change without notice. 4 of 14 REV 1.0 7/5/00 www.icmic.com Figure 3. Definition of Start and Stop Conditions Table 1. X76F400 Instruction Set Command After Start Command Description Password Used 1 S5 S4 S3 S2 S1 S00 Sector Write Write 1 S5 S4 S3 S2 S1 S0 1 Sector Read Read 1 1 1 1 1 1 0 0 Change Write Password Write 1 1 1 1 1 1 1 0 Change Read Password Write 0 1 0 1 0 1 0 1 Password ACK Command None SCL SDA START Condition STOP Condition Illegal command codes will be disregarded. The part will respond with a “no-ACK” to the illegal byte and then return to the standby mode. All write/read operations require a password. PROGRAM OPERATIONS Sector Write The sector write mode requires issuing the 8-bit write command followed by the password and then the data bytes transferred as illustrated in Figure 4. The write command byte contains the address of the sector to be written. Data is written starting at the first address of a sector and 8 bytes must be transferred. After the last byte to be transferred is acknowledged, a stop condition is issued which starts the nonvolatile write cycle. If more or less than 8 bytes are transferred, the data in the sector remains unchanged. ACK Polling Once a stop condition is issued to indicate the end of the host’s write sequence, the X76F400 initiates the internal nonvolatile write cycle. In order to take advantage of the typical 5ms write cycle, ACK polling can begin immediately. This involves issuing the start condition followed by the new command code of 8 bits (first byte of the protocol). If the X76F400 is still busy with the nonvolatile write operation, it will issue a “no- ACK” in response. If the nonvolatile write operation is completed, an “ACK” will be returned and the host can then proceed with the rest of the protocol. Data ACK Polling Sequence ACK Returned? Issue New Command Code Write Sequence Completed Enter ACK Polling Issue START NO YES PROCEED |
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