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T81L0003A Datasheet(PDF) 10 Page - Taiwan Memory Technology |
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T81L0003A Datasheet(HTML) 10 Page - Taiwan Memory Technology |
10 / 20 page TE CH tm T81L0003A TM Technology, Inc. reserves the right P. 10 Publication Date: SEP. 2004 to change products or specifications without notice. Revision: C Where SM0, SM1 specify the serial port mode, as follows: SM0 SM1 Mode Description Baud Rate 0 0 0 shift register f OSC / 12 0 1 1 8-bit UART variable 1 0 2 9-bit UART UART f OSC /64 or f OSC /32 1 1 3 9-bit UART variable Using Timer 1 to Generate Baud Rates When Timer 1 is used as the baud rate generator, the baud rates in Modes 1 and 3 are determined by the Timer 1 overflow rate and the value of SMOD as follows: Mode 1, 3 Baud Rate =2 SMOD/32* (Timer 1 Overflow Rate) The Timer 1 interrupt should be disabled in this application. The Timer itself can be configured for either “timer” or “counter” operation, and in any of its 3 running modes. In the most typical applications, it is configured for “timer” operation, in the auto-reload mode (high nibble of TMOD = 0010B). In that case the baud rate is given by the formula: Mode 1, 3 Baud Rate =2 SMOD*(Oscillator Frequency)/ 32/12 / [256 _ (TH1)] One can achieve very low baud rates with Timer 1 by leaving the Timer 1 interrupt enabled, and configuring the Timer to run as a 16-bit timer (high nibble of TMOD = 0001B), and using the Timer 1 interrupt to do a 16-bit software reload. Using Timer 2 to Generate Baud Rates Timer2 is selected as the baudrate generator by setting TCLK and/or RCLK in T2CON register as followed. T2CON ( address : C8h) MSB LSB TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2 T2CON.7: TF2 Timer2 overflow flag set by timer2 overflow and must be cleared by software. TF2 will not be set when either RCLK=1 or TCLK=1. T2CON.6: EXF2 Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and EXEN2=1. when timer2 interrupt is enabled, EXF2=1 will cause the CPU to vector to the timer2 interrupt routine. EXF2 must be cleared by software. T2CON.5: RCLK Receive clock flag. When set, cause the serial port to use timer2 overflow pulses for its receive clock in mode 1 and 3. RCLK=0 causes timer1 overflow to be used for the receive clock T2CON.4: TCLK Transmit clock flag. When set, cause the serial port to use timer2 overflow pulses for its transmit clock in mode 1 and 3. TCLK=0 causes timer1 overflow to be used for the transmit clock T2CON.3: EXEN2 Timer2 external enable flag. When set, allows a capture or reload to occur as a result of a negative transition on T2EX if timer2 is not being used to clock the serial port. EXEN2=0 causes timer2 to ignore events at T2EX. T2CON.2: Start/stop control for timer2. A logic 1 starts the timer |
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