SC16IS752 datasheet(17/59 Pages) NXP

Part #	SC16IS752

Description	Dual UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support

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Manufacturer	NXP [NXP Semiconductors]

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17 / 59 page

SC16IS752_SC16IS762_7

Product data sheet

Rev. 07 — 19 May 2008

17 of 59

NXP Semiconductors

SC16IS752/SC16IS762

Dual UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR

Figure 10 shows the internal prescaler and baud rate generator circuitry.

DLL and DLH must be written to in order to program the baud rate. DLL and DLH are the

least signiﬁcant and most signiﬁcant byte of the baud rate divisor. If DLL and DLH are both

zero, the UART is effectively disabled, as no baud clock will be generated.

Remark: The programmable baud rate generator is provided to select both the transmit

and receive clock rates.

Table 7 and Table 8 show the baud rate and divisor correlation for crystal with frequency

1.8432 MHz and 3.072 MHz, respectively.

Figure 11 shows the crystal clock circuit reference.

Fig 10. Prescaler and baud rate generator block diagram

Table 7.

Baud rates using a 1.8432 MHz crystal

Desired baud rate

(bit/s)

Divisor used to generate

16

× clock

Percent error difference

between desired and actual

50

2304

0

75

1536

0

110

1047

0.026

134.5

857

0.058

150

768

0

300

384

0

600

192

0

1200

96

0

1800

64

0

2000

58

0.69

2400

48

0

3600

32

0

4800

24

0

7200

16

0

9600

12

0

19200

6

0

38400

3

0

56000

2

2.86

BAUD RATE

GENERATOR

LOGIC

MCR[7] = 1

MCR[7] = 0

PRESCALER

LOGIC

(DIVIDE-BY-1)

INTERNAL

OSCILLATOR

LOGIC

002aaa233

XTAL1

XTAL2

input clock

PRESCALER

LOGIC

(DIVIDE-BY-4)

reference

clock

internal

baud rate

clock for

transmitter

and receiver

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