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DS80C320-ENG Datasheet(PDF) 39 Page - Dallas Semiconductor |
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DS80C320-ENG Datasheet(HTML) 39 Page - Dallas Semiconductor |
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39 / 175 page  High-Speed Microcontroller User’s Guide 39 of 175 Serial Port Control (SCON1) 7 6 5 4 3 2 1 0 SFR C0h SM0/FE_1 SM1_1 SM2_1 REN_1 TB8_1 RB8_1 TI_1 RI_1 RW-0 RW-0 RW-0 RW-0 RW-0 RW-0 RW-0 RW-0 R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset SM0-2 Bits 7-5 Serial Port 1 Mode. These bits control the mode of serial port 1 as shown below. In addition, the SM0 and SM2 bits have secondary functions as Shown below. SM0 SM1 SM2 MODE FUNCTION LENGTH PERIOD 0 0 0 0 Synchronous 8 bits 12tCLK 0 0 1 0 Synchronous 8 bits 4tCLK 0 1 X 1 Asynchronous 10 bits Timer 1 baud rate equation 1 0 0 2 Asynchronous 11 bits 64tCLK (SMOD=0) 32tCLK (SMOD=1) 1 0 1 2 Asynchronous w/ Multiprocessor communication 11 bits 64tCLK (SMOD=0) 32tCLK (SMOD=1) 1 1 0 3 Asynchronous 11 bits Timer 1 baud rate equation 1 1 1 3 Asynchronous w/ Multiprocessor communication 11 bits Timer 1 baud rate equation SM0/FE_1 Bit 7 Framing Error Flag. When SMOD0 (PCON.6)=0, this bit (SM0) is used to select the mode for serial port 1. When SMOD0 (PCON.6)=1, this bit (FE) will be set upon detection of an invalid stop bit. When used as FE, this bit must be cleared in software. Once the SMOD0 bit is set, modifications to this bit will not affect the serial port mode settings. Although accessed from the same register, internally the data for bits SM0 and FE are stored in different locations. SM1_1 Bit 6 No alternate function. SM2-2 Bit 5 Multiple CPU Communications. The function of this bit is dependent on the serial port 1 mode. Mode 0: Selects 12 tCLK or 4tCLK period for synchronous port 1 data transfers. Mode 1: When this bit is set, reception is ignored (RI_1) is not set) if invalid stop bit received. Mode 2/3: when this bit is set, multiprocessor communications are enabled in mode 2 and 3. This will prevent RI_1 from being set, and an interrupt being asserted, if the 9 th bit received is not 1. |
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