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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72344 датащи(PDF) 128 Page - STMicroelectronics |
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ST72344 датащи(HTML) 128 Page - STMicroelectronics |
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128 / 191 page  ST72340, ST72344, ST72345 128/191 11.7 I2C TRIPLE SLAVE INTERFACE WITH DMA (I2C3S) 11.7.1 Introduction The I2C3S interface provides three I2C slave func- tions, supporting both standard (up to 100kHz) and fast I2C mode (100 to 400 kHz). Special fea- tures are provided for: ■ Full-speed emulation of standard I 2C E2PROMs ■ Receiving commands to perform user-defined operations such as IAP 11.7.2 Main Features ■ Three user configurable independent slave addresses can be individually enabled ■ 2x 256 bytes and 1x 128 bytes buffers with fixed addresses in RAM ■ 7-bit Addressing ■ DMA transfer to/from I 2C bus and RAM ■ Standard (transfers 256 bytes at up to 100 kHz) ■ Fast Mode (transfers 256 bytes at up to 400 kHz) ■ Transfer error detection and handling ■ 3 interrupt flags per address for maximum flexibility ■ Two interrupt request lines (one for Slaves 1 and 2, the other for Slave 3) ■ Full emulation of standard I 2C EEPROMs: – Supports 5 read/write commands and com- bined format –No I2C clock stretching – Programmable page size (8/16 bytes) or full buffer – Configurable write protection ■ Data integrity and byte-pair coherency when reading 16-bit words from I2C bus Figure 68. I2C3S Interface Block Diagram I2C SLAVE ADDRESS 1 I2C SLAVE ADDRESS 2 I2C SLAVE ADDRESS 3 CPU RAM 128 BYTES SLAVE 3 BUFFER 256 BYTES SLAVE 1 BUFFER 256 BYTES SLAVE 2 BUFFER DMA COMPARATOR CONTROL LOGIC 8-BIT SHIFT REGISTER SCL or SCLI SDA or SDAI Slave 1 or 2 Interrupt Slave 3 Interrupt DATA E2PROM 256 BYTES REGISTER SHADOW |
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