Quatech ES-100 user manual Baud Rate Selection, Value Values %

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BAUD RATE SELECTION

The 16450 or 16550 UART determines the baud rate of the serial output using a combination of the clock input frequency and the value written to the divisor latches. Standard personal computer serial interfaces use an input clock of 1.8432 MHz. A table of baud rates available is given in Figure 22.

DESIRED BAUD	DIVISOR LATCH	ERROR BETWEEN DESIRED AND ACTUAL
RATE	VALUE	VALUES (%)

50	2304	-

75	1536	-

110	1047	0.026

150	768	-

300	384	-

600	192	-

1200	96	-

1800	64	-

2000	58	0.69

2400	48	-

3600	32	-

4800	24	-

7200	16	-

9600	12	-

19200	6	-

38400	3	-

56000	2	2.86

Figure 22 --- Divisor Latch settings for common baud rates

using 1.8432 MHz input clock

Quatech ES-100D User's Manual

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Contents ES-100 Page Warranty Information Page EC Council Directive 89/336/EEC FCC Class BGeneral Information Installation Port Address IRQDiagram of ES-100D Setting the address Addressing PortsExamination of a serial port base address Interrupt Sharing Interrupt Level IRQInterrupt Status register Interrupt Status Register contents This page intentionally left blank External Connections Channel Output Configuration ES-100D connector definitionsES-100D output connectors Serial Port Functional Description Accessing the Serial Port registers DlabInterrupt Enable Register Interrupt Identification RegisterInterrupt Identification Register bit definitions Fifo Control Register 16550 only RXT0Line Control Register EPS PEN ParityModem Control Register Modem Control Register bit definitionsLine Status Register Line Status Register bit definitions Modem Status Register Scratchpad RegisterFifo Interrupt Mode Operation 16550 Uart only When the receiver Fifo and receiver interrupts are enabledFifo polled mode operation 16550 Uart only Baud Rate Selection Value Values %Specifications 16450 16550 optionalTroubleshooting Computer will not boot upVersion March Quatech Inc, ES-100 Manual