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S-7750C42XX-HCT1 Datasheet(PDF) 10 Page - Seiko Instruments Inc |
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S-7750C42XX-HCT1 Datasheet(HTML) 10 Page - Seiko Instruments Inc |
10 / 44 page PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT) S-7750C Rev.1.1_00 Seiko Instruments Inc. 10 Device Addressing To start communication, the master device (MPU) on the system generates a start condition for the slave device (S-7750C). After that, the master device sends a device address with 7-bit and Read / Write instruction code with 1-bit on the SDA bus. The higher 3 bits in a device address (DC2, DC1, DC0) are device codes. The fixed value which users selected by option (either one of 000, 001, 010, 011, 100, 101, 110, 111) is a device code. Command is omitted if a device code does not correspond. The next 1-bit C TA / is a bit for timer address setting / command switch. When C TA / = “1”, the next 3 bits (C2, C1, C0) are used as address, when C TA / = “0”, (C2, C1, C0) are used as command for the timer setting register. Address / command DC2 DC1 DC0 TA / C C2 C1 C0 R / W Device Code MSB LSB Read / Write bit ACK Acknowledgment Signal STA Start Condition B7 B6 B5 B4 B3 B2 B1 B0 MSB LSB ACK STP Register data Stop Condition Timer address setting / command switch Figure 10 Device Addressing |
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