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ST7538 Arkusz danych(PDF) 11 Page - STMicroelectronics |
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ST7538 Arkusz danych(HTML) 11 Page - STMicroelectronics |
11 / 30 page 11/30 ST7538 Host Processor Interface ST7538 exchanges data with the host processor thorough a serial interface. The data transfer is managed by REG_DATA and RxTx Lines, while data are exchanged using RxD, TxD and CLR/T lines. Four are the ST7538 working modes: s Data Reception s Data Transmission s Control Register Read s Control Register Write REG_DATA and RxTx lines are level sensitive inputs. Table 4. s Mains Access ST7538 features two type of communication interfaces: - Asynchronous - Synchronous The selection can be done through the internal Control Register. Figure 1. – Asynchronous Mode. ST7538 allows to interface the Host Controller using a 3 line interface (RXD,TXD & RxTx). Data are exchange without any auxiliary Clock reference in an Asynchronous mode without adding any protocol bits. The host controller has to recover the clock reference in receiving Mode and control the Bit time in transmission mode. RxD line is forced to a low logic level when no carrier is detected. REG_DATA RxTx Data Transmission 0 0 Data Reception 0 1 Control Register Read 1 1 Control Register Write 1 0 RxD CLR/T REG_DATA RxTx ST7538 Host Controller TxD Asynchronous Data Interface RxD CLR/T REG_DATA RxTx ST7538 Host Controller TxD Synchronous Data Interface D03IN1415 |
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