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MTV012E Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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4 / 14 page MYSON TECHNOLOGY MTV012E MTV012E Revision 1.2 12/23/1998 4/14 DA11E = 1 → Pin #27 is DA11. = 0 → Pin #27 is P2.6. DA10E = 1 → Pin #28 is DA10. = 0 → Pin #28 is P2.7. * SINT0 should be 0 in this case. 2. External Special Function Registers (XFR) The XFR is a group of registers allocated in the 8051 external RAM area. Most of the registers are used for monitor control or PWM DAC. The program can initialize Ri value and use "MOVX" instruction to access these registers. 3. PWM DAC Each D/A converter's output pulse width is controlled by an 8-bit register in the XFR. The frequency of these outputs is (Xtal frequency)/253 or (Xtal frequency)/256, selected by DIV253. If DIV253=1, writing FDH/FEH/FFH to the DAC register generates a stable high output. If DIV253=0, the output will pulse low at least once even if the DAC register's content is FFH. Writing 00H to the DAC register generates stable low output. reg name addr bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 DA0 20h (r/w) DA0b7 DA0b6 DA0b5 DA0b4 DA0b3 DA0b2 DA0b1 DA0b0 DA1 21h (r/w) DA1b7 DA1b6 DA1b5 DA1b4 DA1b3 DA1b2 DA1b1 DA1b0 DA2 22h (r/w) DA2b7 DA2b6 DA2b5 DA2b4 DA2b3 DA2b2 DA2b1 DA2b0 DA3 23h (r/w) DA3b7 DA3b6 DA3b5 DA3b4 DA3b3 DA3b2 DA3b1 DA3b0 DA4 24h (r/w) DA4b7 DA4b6 DA4b5 DA4b4 DA4b3 DA4b2 DA4b1 DA4b0 DA5 25h (r/w) DA5b7 DA5b6 DA5b5 DA5b4 DA5b3 DA5b2 DA5b1 DA5b0 DA6 26h (r/w) DA6b7 DA6b6 DA6b5 DA6b4 DA6b3 DA6b2 DA6b1 DA6b0 DA7 27h (r/w) DA7b7 DA7b6 DA7b5 DA7b4 DA7b3 DA7b2 DA7b1 DA7b0 DA8 28h (r/w) DA8b7 DA8b6 DA8b5 DA8b4 DA8b3 DA8b2 DA8b1 DA8b0 DA9 29h (r/w) DA9b7 DA9b6 DA9b5 DA9b4 DA9b3 DA9b2 DA9b1 DA9b0 DA10 2Ah (r/w) DA10b7 DA10b6 DA10b5 DA10b4 DA10b3 DA10b2 DA10b1 DA10b0 DA11 2Bh (r/w) DA11b7 DA11b6 DA11b5 DA11b4 DA11b3 DA11b2 DA11b1 DA11b0 DA12 2Ch (r/w) DA12b7 DA12b6 DA12b5 DA12b4 DA12b3 DA12b2 DA12b1 DA12b0 DA13 2Dh (r/w) DA13b7 DA13b6 DA13b5 DA13b4 DA13b3 DA13b2 DA13b1 DA13b0 WDT 80h WEN WCLR CLRDDC DIV253 X WDT2 WDT1 WDT0 DA0 (r/w) : The output pulse width control for DA0. DA1 (r/w) : The output pulse width control for DA1. DA2 (r/w) : The output pulse width control for DA2. DA3 (r/w) : The output pulse width control for DA3. DA4 (r/w) : The output pulse width control for DA4. DA5 (r/w) : The output pulse width control for DA5. DA6 (r/w) : The output pulse width control for DA6. DA7 (r/w) : The output pulse width control for DA7. DA8 (r/w) : The output pulse width control for DA8. DA9 (r/w) : The output pulse width control for DA9. DA10 (r/w) : The output pulse width control for DA10. DA11 (r/w) : The output pulse width control for DA11. DA12 (r/w) : The output pulse width control for DA12. DA13 (r/w) : The output pulse width control for DA13. WDT (w) : Watchdog timer & special control bit. DIV253 = 1 → The PWM DAC output frequency is (Xtal frequency)/253. = 0 → The PWM DAC output frequency is (Xtal frequency)/256. *1. All D/A converters are centered with value 80h after power-on. |
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