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DS89C450 Datasheet(PDF) 10 Page - Dallas Semiconductor |
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DS89C450 Datasheet(HTML) 10 Page - Dallas Semiconductor |
10 / 46 page DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers 10 of 46 Figure 4. Serial Port Timing tXLXL tXHDV tXHDX tXHQX tQVXH TRANSMIT RECEIVE ALE WRITE TO SBUF PSEN RXD DATA OUT TXD CLOCK TXD CLOCK R1 TI WRITE TO SCON TO CLEAR RI RXD DATA IN D0 DI D3 D4 D2 D5 D6 D7 D7 D6 D5 D4 D3 D2 DI D0 RXD DATA IN TXD CLOCK D0 DI D6 D7 WRITE TO SCON TO CLEAR RI R1 D0 DI D6 D7 1/(XTAL FREQ/12) ALE PSEN WRITE TO SBUF RXD DATA OUT TXD CLOCK TI TXD CLOCK SERIAL PORT (SYNCHRONOUS MODE) SM2 = 0 TDX CLOCK = XTAL FREQ/12 SERIAL PORT (SYNCHRONOUS MODE) SM2 = 1 TDX CLOCK = XTAL FREQ/4 |
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