SC16C751B datasheet(8/32 Pages) NXP

8 / 32 page

SC16C751B_2

Product data sheet

Rev. 02 — 10 October 2008

8 of 32

NXP Semiconductors

SC16C751B

5 V, 3.3 V and 2.5 V UART with 64-byte FIFOs

The generator divides the input 16

× clock by any divisor from 1 to (216 − 1). Customized

baud rates can be achieved by selecting the proper divisor values for the MSB and LSB

sections of baud rate generator.

Programming the baud rate generator registers DLM (MSB) and DLL (LSB) provides a

user capability for selecting the desired ﬁnal baud rate. The example in Table 5 shows

selectable baud rates when using a 1.8432 MHz crystal.

For custom baud rates, the divisor value can be calculated using Equation 1:

(1)

Fig 3.

Crystal oscillator connection

Table 5.

Baud rates using 1.8432 MHz or 3.072 MHz crystal

Using 1.8432 MHz crystal

Using 3.072 MHz crystal

Desired

baud rate

Divisor for

× clock

Baud rate

error

Desired

baud rate

Divisor for

× clock

Baud rate

error

2304

3840

1536

2560

110

1047

0.026

110

1745

0.026

134.5

857

0.058

134.5

1428

0.034

150

768

150

1280

300

384

300

640

600

192

600

320

1200

160

1800

107

0.312

2000

0.69

2000

2400

3600

0.628

4800

7200

1.23

9600

19200

38400

56000

2.86

002aaa870

47 pF

XTAL1

XTAL2

1.8432 MHz

22 pF

33 pF

XTAL1

XTAL2

1.5 k

Ω

1.8432 MHz

22 pF

divisor in decimal

()

XTAL1 clock frequency

serial data rate

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