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ST16C552AIJ68 Scheda tecnica(PDF) 16 Page - Exar Corporation |
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ST16C552AIJ68 Scheda tecnica(HTML) 16 Page - Exar Corporation |
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16 / 39 page ![]() 16 ST16C552/552A Rev. 3.40 REGISTER FUNCTIONAL DESCRIPTIONS The following table delineates the assigned bit functions for the eighteen 552/552A internal registers. The assigned bit functions are more fully defined in the following paragraphs. Table 7, ST16C552/552A INTERNAL REGISTERS A2 A1 A0 Register BIT-7 BIT-6 BIT-5 BIT-4 BIT-3 BIT-2 BIT-1 BIT-0 [Default] Note 5* General Register Set: Note 1* 0 0 0 RHR [XX] bit-7 bit-6 bit-5 bit-4 bit-3 bit-2 bit-1 bit-0 0 0 0 THR [XX] bit-7 bit-6 bit-5 bit-4 bit-3 bit-2 bit-1 bit-0 0 0 1 IER [00] 0 0 En 0 Modem Receive Transmit Receive Pwr Status Line Holding Holding down Interrupt Status Register Register mode interrupt interrupt 0 1 0 FCR [00] RCVR RCVR 0 0 DMA XMIT RCVR FIFO trigger trigger mode FIFO FIFO enable (MSB) (LSB) select reset reset 0 1 0 ISR [01] FIFO’s FIFO’s 0 0 INT INT INT INT enabled enabled priority priority priority status bit-2 bit-1 bit-0 0 1 1 LCR [00] divisor set set even parity stop word word latch break parity parity enable bits length length enable bit-1 bit-0 1 0 0 MCR [00] Pwr 0 0 loop INT A/B [X] -RTS -DTR down back enable 1 0 1 LSR [60] FIFO THR & THR. break framing parity overrun receive data TSR empty interrupt error error error data error empty ready 1 1 0 MSR [X0] CD RI DSR CTS delta delta delta delta -CD -RI -DSR -CTS 1 1 1 SPR [FF] bit-7 bit-6 bit-5 bit-4 bit-3 bit-2 bit-1 bit-0 Special Register Set: Note *2 0 0 0 DLL [XX] bit-7 bit-6 bit-5 bit-4 bit-3 bit-2 bit-1 bit-0 0 0 1 DLM [XX] bit-15 bit-14 bit-13 bit-12 bit-11 bit-10 bit-9 bit-8 |
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