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AT83C24NDS-PRTIL Datasheet(PDF) 7 Page - ATMEL Corporation |
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AT83C24NDS-PRTIL Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 42 page 7 4234G–SCR–01/07 AT83C24 Address Byte The first byte to send to the device is the address byte. The device controls if the hardware address (A2/CK, A1/RST, A0/3V pins on reset) corresponds to the address given in the address byte (A2, A1, A0 bits). If the level is not stable on A2/CK pin (or A1/RST pin, or A0/3V pin) at reset, the user has to send the commands to the possible address taken by the device. If A2/CK to A0/3V are tied to the host microcontroller and their reset values are unknown, a gen- eral call on the TWI bus allows to reset all the AT83C24 devices and set their address after A2/CK to A0/3V are fixed. Figure 2. Address Byte Up to 8 devices can be connected on the same TWI bus. Each device is configured with a differ- ent combination on A2/CK, A1/RST, A0/3V pins. The corresponding address byte values for read/write operations are listed below. Table 2. Address Byte Values A2 (A2/CK pin) A1 (A1/RST pin) A0 (A0/3V pin) Address Byte for Read Command Address Byte for Write Command 0 0 0 0x41 0x40 0 0 1 0x43 0x42 0 1 0 0x45 0x44 0 1 1 0x47 0x46 1 0 0 0x49 0x48 1 0 1 0x4B 0x4A 1 1 0 0x4D 0x4C 1 1 1 0x4F 0x4E b7 b6 b5 b4 b3 b2 b1 b0 0 0 1 0 A2 A1 A0 R/W Slave Address on 7 Bits 1 for READ Command 0 for WRITE Command |
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