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PCA9554TS,118 Datasheet(PDF) 11 Page - NXP Semiconductors |
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PCA9554TS,118 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 35 page PCA9554_9554A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 9 — 19 March 2013 11 of 35 NXP Semiconductors PCA9554; PCA9554A 8-bit I2C-bus and SMBus I/O port with interrupt Fig 13. Read from register 1 0 0 A2 A1 A0 0 A S0 START condition R/W acknowledge from slave 002aac474 A acknowledge from slave SDA A P command byte acknowledge from master data from register DATA (first byte) slave address STOP condition S (repeated) START condition (cont.) (cont.) 1 0 0 A2 A1 A0 1 A 0 R/W acknowledge from slave slave address at this moment master-transmitter becomes master-receiver and slave-receiver becomes slave-transmitter NA no acknowledge from master data from register DATA (last byte) This figure assumes the command byte has previously been programmed with 00h. Transfer of data can be stopped at any moment by a STOP condition. Fig 14. Read Input Port register 1 0 0 A2 A1 A0 1 A S0 START condition R/W acknowledge from slave 002aac475 A acknowledge from master SCL SDA NA read from port data into port P th(D) 9 8 7 6 5 4 3 2 1 data from port no acknowledge from master data from port DATA 4 slave address DATA 1 STOP condition DATA 2 DATA 3 DATA 4 tsu(D) INT tv(INT_N) trst(INT_N) |
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