OX16CF950 datasheet(39/60 Pages) ETC

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Page 39

OXCF950 DATA SHEET V1.1

OXFORD SEMICONDUCTOR LTD.

TCR[3:0]

Clock cycles per bit

0000 to 0011

0100 to 1111

4-15

Table 33: TCR Sample Clock Configuration

The use of TCR does not require the device to be in 650 or

950 mode although only drivers that have been written to

take advantage of the 950 mode features will be able to

access this register. Writing 0x01 to the TCR will not switch

the device into 1x isochronous mode, this is explained in

the following section. (TCR has no effect in isochronous

mode). If 0x01, 0x10 or 0x11 is written to TCR the device

will operate in 16x mode.

Reading TCR will always return the last value that was

written to it irrespective of mode of operation.

Clock

Frequency

(MHz)

CPR value

Effective

crystal

frequency

Error from

1.8432MHz

(%)

Max. Baud rate

with CPR = 1,

TCR = 16

Max. Baud rate

with CPR = 1,

TCR = 4

1.8432

0x08 (1.000)

1.8432

0.00

115,200

460,800

7.3728

0x20(4.000)

1.8432

0.00

460,800

1,843,200

14.7456

0x80 (8.000)

1.8432

0.00

921,600

3,686,400

18.432

0x50 (10.000)

1.8432

0.00

1,152,000

4,608,000

32.000

0x8B(17.375)

1.8417

0.08

2,000,000

8,000,000

33.000

0x8F (17.875)

1.8462

0.16

2,062,500

8,250,000

40.000

0xAE (21.750)

1.8391

0.22

2,500,000

10,000,000

50.000

0xD9 (27.125)

1.8433

0.01

3,125,000

12,500,000

60.000*

0xFF (31.875)

1.8824

2.13

3,750,000

15,000,000

Table 34: Example clock options and their assosiacted maximum baud rates

System Clock (MHz)

Sampling

Clock

TCR

Value

1.8432

7.372

14.7456

18.432

0x00 115,200

460,750 921,600

1.152M

2.00M

2.50M

3.125M

3.75M

0x0F 122,880

491,467 983,040 1,228,800 2,133,333 2,666,667 3,333,333

4.00M

0x0E 131,657

526,571 1,053,257 1,316,571 2,285,714 2,857,143 3,571,429 4,285,714

0x0D 141,785

567,077 1,134,277 1,417,846 2,461,538 3,076,923 3,846,154 4,615,384

0x0C 153,600

614,333 1,228,800 1,536,000 2,666,667 3,333,333 4,166,667

5.00M

0x0B 167,564

670,182 1,340,509 1,675,636 2,909,091 3,636,364 4,545,455 5,454545

0x0A 184,320

737,200 1,474,560 1,843,200

3.20M

4.00M

5.00M

6.00M

0x09 204,800

819,111 1,638,400 2,048,000 3,555,556 4,444,444 5,555,556 6,666,667

0x08 230,400

921,500 1,843,200 2,304,000

4.00M

5.00M

6.25M

7.50M

0x07 263,314 1,053,143 2,106,514 2,633,143 4,571,429 5,714,286 7,142,857 8,571428

0x06 307,200 1,228,667 2,457,600 3,072,000 5,333,333 6,666,667 8,333,333 10.00M

0x05 368,640 1,474,400 2,949,120 3,686,400

6.40M

8.00M

10.00M

12.00M

0x04 460,800 1,843,000 3,686,400 4,608,000

8.00M

10.00M

12.50M

15.00M

Table 35: Maximum Baud Rates Available at all ‘TCR’ Sampling Clock Values

6.10.4 Input Clock Options

A system clock must be applied to XTLI pin on the device.

The speed of this clock determines the maximum baud rate

at which the device can receive and transmit serial data.

This maximu m is equal to one sixteenth of the frequency of

the system clock (Increasing to one quarter of this value if

TCR=4 is used).

The industry standard system clock for PC COM ports is

1.8432 MHz, limiting the maximum baud rate to 115.2

Kbps. The OXCF950 supports system clocks up to 60MHz

at 5V or 50 MHz at 3.3V and its flexible baud rate

generation hardware means that almost any frequency can

be optionally scaled down for compatibility with standard

devices.

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