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ST24C16M1TR Arkusz danych(PDF) 9 Page - STMicroelectronics |
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ST24C16M1TR Arkusz danych(HTML) 9 Page - STMicroelectronics |
9 / 17 page Write Operations The Multibyte Write mode (only available on the ST24/25C16 versions) is selected when the MODE pin is at VIH and the Page Write mode when MODE pin is at VIL. The MODE pin may be driven dynami- cally with CMOS input levels. Following a START condition the master sends a device select code with the RW bit reset to ’0’. The memory acknowledges this and waits for a byte address. The byte address of 8 bits provides ac- cess to any of the 256 bytes of one memory block. After receipt of the byte address the device again responds with an acknowledge. For the ST24/25W16 versions, any write command with WC = ’1’ (during a period of time from the START condition untill the end of the Byte Address) will not modify data and will NOT be acknowledged on data bytes, as in Figure 10. Byte Write. In the Byte Write mode the master sends one data byte, which is acknowledged by the memory. The master then terminates the transfer by generating a STOP condition. The Write mode is independant of the state of the MODE pin which could be left floating if only this mode was to be used. However it is not a recommended operating mode, as this pin has to be connected to either VIH or VIL, to minimize the stand-by current. Multibyte Write (ST24/25C16 only). For the Mul- tibyte Write mode, the MODE pin must be at VIH. The Multibyte Write mode can be started from any address in the memory. The master sends from one up to 8 bytes of data, which are each acknowledged by the memory. The transfer is terminated by the master generating a STOP condition. The duration of the write cycle is tW = 10ms maximum except when bytes are accessed on 2 contiguous rows (one row is 16 bytes), the programming time is then doubled to a maximum of 20ms. Writing more than 8 bytes in the Multibyte Write mode may modify data bytes in an adjacent row (one row is 16 bytes long). However, the Multibyte Write can properly write up to 16 consecutive bytes only if the first address of these 16 bytes is the first address of the row, the 15 following bytes being written in the 15 following bytes of this same row. AI00870B 7FFh b7 b4 b2 XX 700h Block 7 Protect Flag Enable = 0 Disable = 1 16 byte boundary address Protect Location 600h 500h 400h 1 0 Block Select PB1 PB0 Block 6 Block 5 Block 4 1 0 0 0 1 1 1 0 PB1 PB0 Figure 7. Memory Protection 9/17 ST24/25C16, ST24/25W16 |
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