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Z86C34 датащи(PDF) 53 Page - Zilog, Inc. |
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Z86C34 датащи(HTML) 53 Page - Zilog, Inc. |
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53 / 70 page ![]() Z86C34/C35/C36/C44/C45/C46 ZiLOG CMOS Z8® MCUs with ASCI UART DS007601-Z8X0499 P R E L I M I N A R Y 53 ASCI TIME CONSTANT REGISTER (ASTL) (%(A)06H: READ/WRITE) ASCI TIME CONSTANT REGISTER (ASTH) (%(A)07H: READ/WRITE) The ASTL and ASTH registers are only used when the BRG mode bit in the ASEXT register is set to a 1. These two 8- bit registers form a 16-bit counter with a flip-flop logic cir- cuit (DIVIDE-BY-2) on the output so that the final BRG out- put is symmetrical. The values written to these registers de- termine the time constant from which the baud rate is generated. Table 24. ASTL Register Bit Functions Bit 76543210 R ASCI Time Constant Low W Reset 11111111 Table 25. ASTH Register Bit Functions Bit 76543210 R ASCI Time Constant High W Reset 11111111 |
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