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ST16C450CQ48 Datasheet(PDF) 8 Page - Exar Corporation |
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ST16C450CQ48 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 28 page ST16C450 8 Rev. 4.20 FUNCTIONAL DESCRIPTIONS Internal Registers The ST16C450 provides 11 internal registers for monitoring and control. These registers are shown in Table 2 below. These registers function as data holding registers (THR/RHR), interrupt status and control 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). Table 2, INTERNAL REGISTER DECODE A2 A1 A0 READ MODE 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 *3 0 0 0 LSB of Divisor Latch LSB of Divisor Latch 0 0 1 MSB of Divisor Latch MSB of Divisor Latch Note *3: These registers are accessible only when LCR bit-7 is set to a logic 1. |
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