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EM78P451 датащи(PDF) 21 Page - ELAN Microelectronics Corp |
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EM78P451 датащи(HTML) 21 Page - ELAN Microelectronics Corp |
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21 / 54 page ![]() EM78P451 8-Bit Microcontroller with OTP ROM Product Specification (V1.1) 06.30.2003 • 17 (This specification is subject to change without further notice) 4.5 SERIAL PERIPHERAL INTERFACE MODE 4.5.1 Overview & Features 4.5.1.1 Overview Figures 8, 9, and 10 show how EM78P451 communicates with other devices through SPI module. If EM78P451 is a master controller, it sends clock through the SCK pin. A couple of 8-bit data are transmitted and received at the same time. However, if EM78P451is defined as a slave, its SCK pin could be programmed as an input pin. Data will continue to be shifted based on both the clock rate and the selected edge. 4.5.1.2 Features Operation in either Master mode or Slave mode, Three-wire or four-wire synchronous communication; that is, full duplex Programmable baud rates of communication, Programming clock polarity, (RD bit7) Interrupt flag available for the read buffer full, Up to 8 MHz ( maximum ) bit frequency, SPI Module SCK SPIR Reg SDI SPIW Reg SPIS Reg /SS Slave Device SDO Bit 7 SPI Module SPIR Reg SPIW Reg SPIS Reg Master Device Fig. 8 SPI Master/Slave Communication |
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