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P89C668 数据表(PDF) 44 Page - NXP Semiconductors |
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P89C668 数据表(HTML) 44 Page - NXP Semiconductors |
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44 / 89 page ![]() Philips Semiconductors Product data P89C660/P89C662/P89C664/ P89C668 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM 2002 Oct 28 44 80C51 Internal Bus SBUF Zero Detector D Q S CL Write to SBUF TX Control TX Clock Send Data Start RX Control Start RX Clock RI T1 Serial Port Interrupt Input Shift Register (9 Bits) Load SBUF Shift SBUF Read SBUF 80C51 Internal Bus TxD TB8 ÷ 16 1-to-0 Transition Detector Sample ÷ 2 Timer 1 Overflow SMOD = 1 SMOD = 0 Shift Bit Detector Transmit Send S1P1 Shift TX Clock Write to SBUF Start Bit TxD Stop Bit D0 D1 D2 D3 D4 D5 D6 D7 TI RxD RX Clock ÷ 16 Reset Start Bit RxD Stop Bit D0 D1 D2 D3 D4 D5 D6 D7 Bit Detector Sample Times Shift RI Receive Data ÷ 16 Load SBUF Shift 1FFH SU00540 Figure 29. Serial Port Mode 1 |
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