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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P89C51RB2BA датащи(PDF) 18 Page - NXP Semiconductors |
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P89C51RB2BA датащи(HTML) 18 Page - NXP Semiconductors |
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18 / 52 page  Philips Semiconductors Preliminary specification 89C51RB2/89C51RC2/ 89C51RD2 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 1999 Sep 23 18 SMOD1 SMOD0 – POF LVF GF0 GF1 IDL PCON (87H) SM0 / FE SM1 SM2 REN TB8 RB8 TI RI SCON (98H) D0 D1 D2 D3 D4 D5 D6 D7 D8 STOP BIT DATA BYTE ONLY IN MODE 2, 3 START BIT SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR) SM0 TO UART MODE CONTROL 0 : SCON.7 = SM0 1 : SCON.7 = FE SU00044 Figure 8. UART Framing Error Detection SM0 SM1 SM2 REN TB8 RB8 TI RI SCON (98H) D0 D1 D2 D3 D4 D5 D6 D7 D8 1 1 1 0 COMPARATOR 11 X RECEIVED ADDRESS D0 TO D7 PROGRAMMED ADDRESS IN UART MODE 2 OR MODE 3 AND SM2 = 1: INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS” – WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES – WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS. SU00045 Figure 9. UART Multiprocessor Communication, Automatic Address Recognition |
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