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SH79F166AP/044PR Datasheet(PDF) 88 Page - SINOWEALTH Electronic Ltd |
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SH79F166AP/044PR Datasheet(HTML) 88 Page - SINOWEALTH Electronic Ltd |
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88 / 113 page  SH79F166A 88 Table 8.27 ADC定时控制寄存器 94H, Bank0 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 ADT TADC2 TADC1 TADC0 - TS3 TS2 TS1 TS0 R/W R/W R/W R/W - R/W R/W R/W R/W Reset Value (POR/WDT/LVR/PIN) 0 0 0 - 0 0 0 0 Bit Number Bit Mnemonic Description 7-5 TADC[2:0] ADC Clock Period Select bits 000: ADC Clock Period tAD = 2 tSYS 001: ADC Clock Period tAD = 4 tSYS 010: ADC Clock Period tAD = 6 tSYS 011: ADC Clock Period tAD = 8 tSYS 100: ADC Clock Period tAD = 12 tSYS 101: ADC Clock Period tAD = 16 tSYS 110: ADC Clock Period tAD = 24 tSYS 111: ADC Clock Period tAD = 32 tSYS 3-0 TS[3:0] Sample time select bits 2 tAD ≤ Sample time = (TS [3:0]+1) * tAD ≤ 15 tAD Note: (1) Make sure that tAD ≧ 1µs; (2) The minimum sample time is 2 tAD, even TS[3:0] = 0000; The maximum sample time is 15 tAD , even TS[3:0] = 1111; (3) Evaluate the series resistance connected with ADC input pin before set TS[3:0]; (4) Be sure that the series resistance connected with ADC input pin is no more than 10k Ω when 2 t AD sample time is selected; (5) Total conversion time is: 12 tAD + sample time. For Example System Clock (SYSCLK) TADC[2:0] tAD TS[3:0] Sample Time Conversion Time 32.768kHz 000 30.5*2=61 µs 0000 2*61=122 µs 12*61+122=854 µs 000 30.5*2=61 µs 0111 8*61=488 µs 12*61+488=1220 µs 000 30.5*2=61 µs 1111 15*61=915 µs 12*61+915=1647 µs 111 30.5*32=976 µs 0000 2*976=1952 µs 12*976+1952=13664 µs 111 30.5*32=976 µs 0111 8*976=7808 µs 12*976+7808=19520 µs 111 30.5*32=976 µs 1111 15*976=14640 µs 12*976+14640=26352 µs 4MHz 000 0.25*2=0.5 µs - - (tAD < 1µs, not recommended) 001 0.25*4=1 µs 0000 2*1=2 µs 12*1+2=14 µs 001 0.25*4=1 µs 0111 8*1=8 µs 12*1+8=20 µs 001 0.25*4=1 µs 1111 15*1=15 µs 12*1+15=27 µs 111 0.25*32=8 µs 0000 2*8=16 µs 12*8+16=112 µs 111 0.25*32=8 µs 0111 8*8=64 µs 12*8+64=160 µs 111 0.25*32=8 µs 1111 15*8=120 µs 12*8+120=216 µs 12MHz 000 0.083*2=0.166 µs - - (tAD < 1µs, not recommended) 100 0.083*12=1 µs 0000 2*1=2 µs 12*1+2=14 µs 100 0.083*12=1 µs 0111 8*1=8 µs 12*1+8=20 µs 100 0.083*12=1 µs 1111 15*1=15 µs 12*1+15=27 µs 111 0.083*32=2.7 µs 0000 2*2.7=5.4 µs 12*2.7+5.4=37.8 µs 111 0.083*32=2.7 µs 0111 8*2.7=21.6 µs 12*2.7+21.6=54 µs 111 0.083*32=2.7 µs 1111 15*2.7=40.5 µs 12*2.7+40.5=72.9 µs |
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