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UPD784021 Datasheet(PDF) 48 Page - NEC |
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UPD784021 Datasheet(HTML) 48 Page - NEC |
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48 / 90 page  48 m m m m mPD784020, 784021 (3) Real-time output port INTC10 and INTC11 function as the output triggers for the real-time output ports. For these triggers, the macro service can simultaneously set the next output pattern and interval. Therefore, INTC10 and INTC11 can be used to independently control two stepping motors. They can also be applied to PWM and DC motor control. Each time a macro service request (INTC10) is generated, a pattern and timing data are transferred to the buffer register (P0L) and compare register (CR10), respectively. When the contents of timer register 1 (TM1) and CR10 match, another INTC10 is generated, and the P0L contents are transferred to the output latch. When Tn (last byte) is transferred to CR10, a vectored interrupt request (INTC10) is generated. For INTC11, the same operation as that performed for INTC10 is performed. Match (SFR) INTC10 P00-P03 (SFR) Output pattern profile (memory) Output timing profile (memory) Pn Pn–1 P2 P1 Internal bus P0L Output latch CR10 TM1 Internal bus Tn Tn–1 T2 T1 |
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