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SPMCK16Z4MPV20 Datasheet(PDF) 434 Page - Freescale Semiconductor, Inc |
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SPMCK16Z4MPV20 Datasheet(HTML) 434 Page - Freescale Semiconductor, Inc |
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434 / 500 page  REGISTER SUMMARY M68HC16 Z SERIES D-60 USER’S MANUAL or where SCBR[12:0] is in the range of one to 8191. Writing a value of zero to SCBR dis- ables the baud rate generator. There are 8191 different baud rates available. The baud value depends on the value for SCBR and the system clock, as used in the equa- tion above. Table D-41 shows possible baud rates for a 16.78-MHz system clock. The maximum baud rate with this system clock speed is 524 kbaud. D.7.10 SCI Control Register 1 SCCR1 contains SCI configuration parameters, including transmitter and receiver en- able bits, interrupt enable bits, and operating mode enable bits. SCCR0 can be read or written at any time. The SCI can modify the RWU bit under certain circumstances. Changing the value of SCCR1 bits during a transfer operation can disrupt the transfer. Table D-41 Examples of SCI Baud Rates Nominal Baud Rate Actual Baud Rate Percent Error Value of SCBR 500,00.00 524,288.00 4.86 1 38,400.00 37,449.14 –2.48 14 32,768.00 32,768.00 0.00 16 19,200.00 19,418.07 1.14 27 9,600.00 9,532.51 –0.70 55 4,800.00 4,809.98 0.21 109 2,400.00 2,404.99 0.21 218 1,200.00 1,199.74 –0.02 437 600.00 599.87 –0.02 874 300.00 299.94 –0.02 1,748 110.00 110.01 0.01 4,766 64.00 64.00 0.01 8,191 SCCR1A — SCIA Control Register 1 $YFFC1A SCCR1B — SCIB Control Register 1 $YFFC2A 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 NOT USED LOOPS WOMS ILT PT PE M WAKE TIE TCIE RIE ILIE TE RE RWU SBK RESET: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SCI Baud Rate f sys 32 SCBR[12:0] × -------------------------------------------- = SCBR[12:0] f sys 32 SCI Baud Rate Desired × --------------------------------------------------------------------------- = Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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