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CX20493 数据表(PDF) 90 Page - Synaptics Incorporated. |
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CX20493 数据表(HTML) 90 Page - Synaptics Incorporated. |
90 / 94 page CX81801-7x/8x SmartV.XX Modem Data Sheet 5-10 Conexant 102199B 5.2.10 Divisor Registers (Addr = 0 and 1, DLAB = 1) The Divisor Latch LS (least significant byte) and Divisor Latch MS (most significant byte) are two read-write registers at locations 0 and 1 when DLAB = 1, respectively. The baud rate is selected by loading each divisor latch with the appropriate hex value. Programmable values corresponding to the desired baud rate are listed in Table 5-3. 1. SCR - Scratch Register (Addr = 7) The Scratchpad Register is a read-write register at location 7. This register is not used by the modem and can be used by the host for temporary storage. Table 5-3. Programmable Baud Rates Divisor Latch (Hex) MS LS Divisor (Decimal) Baud Rate 06 00 1536 75 04 17 1047 110 03 00 768 150 01 80 384 300 00 C0 192 600 00 60 96 1200 00 30 48 2400 00 18 24 4800 00 0C 12 9600 00 06 6 19200 00 04 4 28800 00 03 3 38400 00 02 2 57600 00 01 1 115200 00 00 NA 230400 5.3 Receiver FIFO Interrupt Operation 5.3.1 Receiver Data Available Interrupt When the FIFO mode is enabled (FCR0 = 1) and receiver interrupt (RX Data Available) is enabled (IER0 = 1), receiver interrupt operation is as follows: The Receiver Data Available Flag (LSR0) is set as soon as a received data character is available in the RX FIFO. LSR0 is cleared when the RX FIFO is empty. The Receiver Data Available interrupt code (IIR0-IIR4 = 4h) is set whenever the number of received data bytes in the RX FIFO reaches the trigger level specified by FCR6-FCR7 bits; it is cleared whenever the number of received data bytes in the RX FIFO drops below the trigger level specified by FCR6-FCR7 bits. The HINT interrupt is asserted whenever the number of received data bytes in the RX FIFO reaches the trigger level specified by FCR6-FCR7 bits. HINT interrupt is de- asserted when the number of received data bytes in the RX FIFO drops below the trigger level specified by FCR6-FCR7 bits. |
类似零件编号 - CX20493 |
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类似说明 - CX20493 |
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