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X1205V8 数据表(PDF) 9 Page - Xicor Inc. |
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X1205V8 数据表(HTML) 9 Page - Xicor Inc. |
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9 / 22 page  X1205 – Preliminary Information REV 1.0.9 8/29/02 Characteristics subject to change without notice. 9 of 22 www.xicor.com Following the Slave Byte is a two byte word address. The word address is either supplied by the master device or obtained from an internal counter. On power up the internal address counter is set to address 0H, so a current address read of the CCR array starts at address 0. When required, as part of a random read, the master must supply the 2 Word Address Bytes as shown in Figure 6. In a random read operation, the slave byte in the “dummy write” portion must match the slave byte in the “read” section. For a random read of the Clock/Control Registers, the slave byte must be 1101111x in both places. Figure 6. Slave Address, Word Address, and Data Bytes Slave Address Byte Byte 0 D7 D6 D5 D2 D4 D3 D1 D0 A0 A7 A2 A4 A3 A1 Data Byte Byte 3 A6 A5 0 0 0000 0 1 10 1 1 1 R/W 1 0 Word Address 1 Byte 1 Word Address 0 Byte 2 Write Operations Byte Write For a write operation, the device requires the Slave Address Byte and the Word Address Bytes. This gives the master access to any one of the words in the CCR. (Note: Prior to writing to the CCR, the master must write a 02h, then 06h to the status register in two pre- ceding operations to enable the write operation. See “Writing to the Clock/Control Registers.” Upon receipt of each address byte, the X1205 responds with an acknowledge. After receiving both address bytes the X1205 awaits the eight bits of data. After receiving the 8 data bits, the X1205 again responds with an acknowledge. The master then terminates the transfer by generating a stop condition. The X1205 then begins an internal write cycle of the data to the nonvolatile memory. During the internal write cycle, the device inputs are disabled, so the device will not respond to any requests from the master. The SDA output is at high impedance. See Figure 7. Figure 7. Byte Write Sequence S t a r t S t o p Slave Address Word Address 1 Data A C K A C K A C K SDA Bus Signals From The Slave Signals from the Master 0 A C K Word Address 0 1 1 1 1 000 00 0 0 0 10 1 |
类似零件编号 - X1205V8 |
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类似说明 - X1205V8 |
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