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PIC17C752-08/CL bảng dữ liệu(PDF) 149 Page - Microchip Technology |
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PIC17C752-08/CL bảng dữ liệu(HTML) 149 Page - Microchip Technology |
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149 / 328 page ![]() © 1998 Microchip Technology Inc. DS30289A-page 149 PIC17C7XX 15.2.5 MASTER MODE Master mode of operation is supported by interrupt generation on the detection of the START and STOP conditions. The STOP (P) and START (S) bits are cleared from a reset or when the MSSP module is dis- abled. Control of the I2C bus may be taken when the P bit is set, or the bus is idle with both the S and P bits clear. In master mode, the SCL and SDA lines are manipu- lated by the MSSP hardware. The following events will cause SSP Interrupt Flag bit, SSPIF, to be set (SSP Interrupt if enabled): • START condition • STOP condition • Data transfer byte transmitted/received • Acknowledge transmit • Repeated Start FIGURE 15-20: SSP BLOCK DIAGRAM (I2C MASTER MODE) Read Write SSPSR Start bit, Stop bit, Start bit detect, SSPBUF Internal data bus Set/Reset, S, P, WCOL (SSPSTAT) shift clock MSb LSb SDA Acknowledge Generate Stop bit detect Write collision detect Clock Arbitration State counter for end of XMIT/RCV SCL SCL in Bus Collision SDA in SSPADD<6:0> Baud Set SSPIF, BCLIF Reset ACKSTAT, PEN (SSPCON2) rate generator SSPM3:SSPM0 |
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