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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87309VLJ датащи(PDF) 148 Page - National Semiconductor (TI) |
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PC87309VLJ датащи(HTML) 148 Page - National Semiconductor (TI) |
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148 / 192 page  Enhanced Serial Port - UART1 (Logical Device 3) 148 www.national.com 6.7 BANK 2 – EXTENDED CONTROL AND STATUS REGISTERS Bank 2 contains two alternate Baud rate Generator Divisor ports and the Extended Control Registers (EXCR1 and EXCR2). TABLE 6-11. Bank 2 Register Set 6.7.1 Baud Generator Divisor Ports, LSB (BGD(L)) and MSB (BGD(H)) These ports perform the same function as the Legacy Baud Divisor Ports in Bank 1 and are accessed identically to them, but do not change the operation mode of the module when accessed. Refer to Section 6.6.1 on page 147 for more detail. Use these ports to set the baud rate when operating in Ex- tended mode to avoid fallback to a Non-Extended operation mode, i.e., 16550 compatible.When programming the baud rate, writing to BGDH causes the baud rate to change im- mediately. Offset Register Name Description 00h BGD(L) Baud Generator Divisor Port (Low byte) 01h BGD(H) Baud Generator Divisor Port (High byte) 02h EXCR1 Extended Control Register 1 03h LCR/BSR Line Control/ Bank Select Register 04h EXCR2 Extended Control Register 2 05h Reserved 06h TXFLV TX_FIFO Level 07h RXFLV RX_FIFO Level 76543210 Reset Required x x x x x x x x Low Byte Port (BGD(L)) Bank 2, Least Significant Byte Baud Generator Divisor of Baud Generator Offset 00h TABLE 6-12. Baud Generator Divisor settings Prescaler Value 13 1.625 1 Baud Divisor % Error Divisor % Error Divisor % Error 50 2304 0.16% 18461 0.00% 30000 0.00% 75 1536 0.16% 12307 0.01% 20000 0.00% 110 1047 0.19% 8391 0.01% 13636 0.00% 134.5 857 0.10% 6863 0.00% 11150 0.02% 150 768 0.16% 6153 0.01% 10000 0.00% 300 384 0.16% 3076 0.03% 5000 0.00% 600 192 0.16% 1538 0.03% 2500 0.00% 1200 96 0.16% 769 0.03% 1250 0.00% 1800 64 0.16% 512 0.16% 833 0.04% 2000 58 0.53% 461 0.12% 750 0.00% 2400 48 0.16% 384 0.16% 625 0.00% 3600 32 0.16% 256 0.16% 416 0.16% 4800 24 0.16% 192 0.16% 312 0.16% 7200 16 0.16% 128 0.16% 208 0.16% 9600 12 0.16% 96 0.16% 156 0.16% 14400 8 0.16% 64 0.16% 104 0.16% 19200 6 0.16% 48 0.16% 78 0.16% 28800 4 0.16% 32 0.16% 52 0.16% 38400 3 0.16% 24 0.16% 39 0.16% 57600 2 0.16% 16 0.16% 26 0.16% 115200 1 0.16% 8 0.16% 13 0.16% 230400 --- --- 4 0.16% --- --- 460800 --- --- 2 0.16% --- --- 750000 --- --- --- --- 2 0.00% 921600 --- --- 1 0.16% --- --- 1500000 --- --- --- --- 1 0.00% |
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