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S-7760A53XX-HCT1 Datasheet(PDF) 11 Page - Seiko Instruments Inc |
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S-7760A53XX-HCT1 Datasheet(HTML) 11 Page - Seiko Instruments Inc |
11 / 53 page ![]() PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT) Rev.1.3_00 S-7760A Seiko Instruments Inc. 11 Device Addressing To start communication, the master device (MPU) on the system generates a start condition for the slave device (S-7760A). After that, the master device sends a device address with 7-bit length and Read/Write instruction code with 1-bit length on the SDA bus. The higher 3 bits in a device address (DC2, DC1, DC0) are device codes. A device code can obtain the fixed value selected by option. Command is omitted if a device code does not correspond. Set the command in the following 4 bits (C3, C2, C1, C0). Next, by selecting either of Read or Write by Read/Write bit, the S-7760A sends an acknowledgement signal back. If the second byte is Read, MPU sends an acknowledgement signal back after outputting data Read with 8-bit length. If it is Write, after outputting Write data with 8-bit length, the S-7760A sends an acknowledgement signal back. To finish these sequential commands, the S-7760A generates a stop condition as its final procedure. There is a 1-byte command for the S-7760A, but inputting the second byte as a dummy does not affect on this device addressing. In this case, the operation for the second byte is as well as for Read/Write because of the bit corresponding to Read/Write in the first byte. Command DC2 DC1 DC0 C3 C2 C1 C0 R / W Device Code MSB LSB Read/Write bit ACK Acknowledgment Signal STA Start B7 B6 B5 B4 B3 B2 B1 B0 MSB LSB ACK STP Register data Stop Figure 13 Device Address |
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