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ST16C454 데이터시트(PDF) 10 Page - Exar Corporation |
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ST16C454 데이터시트(HTML) 10 Page - Exar Corporation |
10 / 29 page ST16C454 10 Rev. 3.31 Internal Registers The 454 provides 12 internal registers for monitoring and control. These resisters are shown in Table 4 below. These registers are similar to those already available in the standard 16C450. These registers function as data holding registers (THR/RHR), interrupt status and con- Table 4, INTERNAL REGISTER DECODE A2 A1 A0 READMODE WRITE MODE General Register Set (THR/RHR, IER/ISR, MCR/MSR, LCR/LSR, SPR): 0 0 0 Receive Holding Register Transmit Holding Register 0 0 1 Interrupt Enable Register 0 1 0 Interrupt Status Register 0 1 1 Line Control Register 1 0 0 Modem Control Register 1 0 1 Line Status Register 1 1 0 Modem Status Register 1 1 1 Scratchpad Register Scratchpad Register Baud Rate Register Set (DLL/DLM): Note *2 0 0 0 LSB of Divisor Latch LSB of Divisor Latch 0 0 1 MSB of Divisor Latch MSB of Divisor Latch Note *2: These registers are accessible only when LCR bit-7 is set to a logic 1. trol registers (IER/ISR), line status and control registers (LCR/LSR), modem status and control registers (MCR/ MSR), programmable data rate (clock) control registers (DLL/DLM), and a user assessable scratchpad register (SPR). Register functions are more fully described in the following paragraphs. |
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