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UPD754144GS 数据表(PDF) 21 Page - NEC |
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UPD754144GS 数据表(HTML) 21 Page - NEC |
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21 / 88 page  21 µPD754144, 754244 Figure 7-2. µPD754244 (Crystal/Ceramic Oscillation) Clock Generator Block Diagram Note Instruction execution Remarks 1. fX: System clock frequency 2. Φ = CPU clock 3. PCC: Processor Clock Control Register 4. One clock cycle (tCY) of the CPU clock is equal to one machine cycle of the instruction. X1 X2 System clock oscillator Oscillation stops 1/2 1/4 1/16 fX Divider 1/4 Φ HALT F/F S RQ S R Q STOP F/F PCC0 PCC1 PCC2 PCC3 PCC2, PCC3 clear HALTNote STOPNote Wait release signal from BT Reset signal Standby release signal from interrupt control circuit PCC 4 · Basic interval timer (BT) · Timer counter · INT0 noise eliminator 1/1~1/4096 · CPU · INT0 noise eliminator Divider |
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