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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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7220 датащи(PDF) 67 Page - Renesas Technology Corp |
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7220 датащи(HTML) 67 Page - Renesas Technology Corp |
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67 / 303 page  2-40 7220 Group User’s Manual FUNCTIONAL DESCRIPTION 2.7 Serial I/O 2.7 Serial I/O The M37221M6-XXXSP/FP has on-chip clock synchronous serial I/O which can receive and transmit 8-bit data serially. Because pin SOUT also can be used as the serial I/O data input pin, it can transmit and receive with only one signal line. 2.7.1 Structure of serial I/O Serial I/O consists of q Serial I/O register q Serial I/O mode register q Serial I/O counter q Clock source generating counter The serial I/O register is the register which 8-bit transfer data is written into. Each function of serial I/O can be controlled by setting appropriate values to the serial I/O mode register. Serial I/O transfers data to and from the internal CPU via the data bus, and it transfers data to and from external devices via ports P2 2–P20. When using the serial I/O, ports P2 2–P20 have the following functions: q P20: Serial I/O synchronous clock input/output pin (SCLK) q P21: Serial I/O data input/output pin (SOUT) q P22: Serial I/O data input pin (SIN) The functions of these ports can be selected by the serial I/O mode register. The transfer clock that determines the serial data transfer rate can selected 4 kinds of clock sources with the serial I/O mode register. Figure 2.7.1 shows the serial I/O block diagram, Figure 2.7.2 shows the serial I/O mode register. |
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