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7540 Datasheet(PDF) 201 Page - Renesas Technology Corp |
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7540 Datasheet(HTML) 201 Page - Renesas Technology Corp |
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201 / 366 page  2-125 REJ09B0018-0200Z Rev.2.00 Jun 21, 2004 7540 Group APPLICATION 2.7 Serial I/O2 (2) Communication using serial I/O2 (transmit/receive) Outline: 2-byte data is transmitted and received, using the serial I/O2. Port P00 is used for communication control and outputs the quasi-SRDY signal. Specifications: • The serial I/O2, clock synchronous serial I/O, is used. • Synchronous clock frequency : 125 kHz; f(XIN) = 8 MHz divided by 64 • Transfer direction : LSB first • The receiver outputs the quasi-SRDY signal at 2 ms intervals which the timer generates, and 2-byte data is transferred from the transmitter to the receiver. Figure 2.7.9 shows a connection diagram, Figure 2.7.10 shows a timing chart, Figure 2.7.11 shows the control procedure of transmitter, and Figure 2.7.12 shows an example of control procedure of receiver. Fig. 2.7.9 Connection diagram Fig. 2.7.10 Timing chart Transmitter P37/INT0 SCLK SDATA 7540 Group P00 SCLK SDATA 7540 Group Receiver Quasi-SRDY SCLK SDATA D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 2 ms ..... ..... ..... |
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