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SC28L202A1B Datasheet(PDF) 32 Page - NXP Semiconductors |
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SC28L202A1B Datasheet(HTML) 32 Page - NXP Semiconductors |
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32 / 77 page  Philips Semiconductors Objective specification SC28L202 Dual UART 2000 Feb 10 26 RxCSR – Receiver Clock Select Register A and B TxCSR Transmitter Clock Select Register A and B Both registers consist of single 6–bit field that selects the clock source for the receiver and transmitter respectively. During a read the unused bits in this register read b’000. The “BRG” baud rates (fixed BRG rates) shown in the table below are based on the Sclk crystal frequency of 14.7456 MHz. The baud rates shown below will vary as the Sclk crystal clock varies. For example, if the Sclk rate is changed to 7.3728 MHz all the rates below will reduce by 1/2. Bit 7 Bit 6 Bits 5:0 Reserved Reserved Transmitter/Receiver Clock select code, See Clock Multiplex Table below Rx and Tx Clock Select Table NOTE: Sclk maximum rate is 50 MHz. Data clock rates will follow exactly the ratio of the X1/Sclk to 14.7654 MHz Tx A Clock Select Code Clock selection, Sclk = 14.7456 MHz Tx A Clock Select Code Clock selection, Sclk = 14.7456 MHz 00 0000 BRG – 50 01 0000 BRG – 75 00 0001 BRG – 110 01 0001 BRG – 150 00 0010 BRG – 134.5 01 0010 BRG – 450 00 0011 BRG – 200 01 0011 BRG – 1800 00 0100 BRG – 300 01 0100 BRG – 2000 00 0101 BRG – 600 01 0101 BRG – 14.4K 00 0110 BRG – 1200 01 0110 BRG – 19.2K 00 0111 BRG – 1050 01 0111 BRG – 28.8K 00 1000 BRG – 2400 01 1000 BRG – 57.6K 00 1001 BRG – 4800 01 1001 BRG – 115.2K 00 1010 BRG – 7200 01 1010 BRG – 230.4K 00 1011 BRG – 9600 01 1011 BRG – 460.8K 00 1100 BRG – 38.4K 01 1100 BRG – 921.6K 00 1101 Timer 0 01 1101 Timer 1 00 1110 I/O3 A transmitter – 16x External * 01 1110 PBRG 0 00 1111 I/O3 A transmitter – 1x External * 01 1111 Midi rate 31.25 KHz 1.66% error Tx A Clock Select Code Clock selection, Sclk = 14.7456 MHz Tx A Clock Select Code Clock selection, Sclk = 14.7456 MHz 11 0000 to 11 1101 Reserved 11 1110 PBRG 1 11 1111 Reserved This field selects the baud rate clock for the Channel A transmitter. * External clock Pin and external clock mode assignment. Tx/Rx CSR x [5:0] RxC Channel A TxC Channel B RxC channel B 001110 I/O4 A 16x I/O5 A 16x I/O6 A 16x 001111 I/O4 A 1X I/O5 A 1X I/O6 A 1X |
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