C8051F045 查看數據表（PDF） - Silicon Laboratories

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C8051F045

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F040/1/2/3/4/5/6/7

Table 22.1. Timer Settings for Standard Baud Rates Using the Internal 24.5 MHz

Oscillator

Frequency: 24.5 MHz

Target Baud Rate Oscillator Timer Clock SCA1-SCA0 T1M* Timer 1

Baud Rate % Error

Divide

Source

(pre-scale

Reload

(bps)

Factor

select)*

Value

(hex)

230400

-0.32%

106

SYSCLK

XX

1

0xCB

115200

-0.32%

212

SYSCLK

XX

1

0x96

57600

0.15%

426

SYSCLK

XX

1

0x2B

28800

-0.32%

848

SYSCLK / 4

01

0

0x96

14400

0.15%

1704 SYSCLK / 12

00

0

0xB9

9600

-0.32%

2544 SYSCLK / 12

00

0

0x96

2400

-0.32%

10176 SYSCLK / 48

10

0

0x96

1200

0.15%

20448 SYSCLK / 48

10

0

0x2B

X = Don’t care

*Note: SCA1-SCA0 and T1M bit definitions can be found in Section 23.1.

Table 22.2. Timer Settings for Standard Baud Rates Using an External 25.0 MHz

Oscillator

Frequency: 25.0 MHz

Target

Baud Rate

(bps)

230400

115200

57600

28800

14400

9600

2400

1200

Baud Rate

% Error

-0.47%

0.45%

-0.01%

0.45%

-0.01%

0.15%

0.45%

-0.01%

Oscillator

Divide

Factor

108

218

434

872

1736

2608

10464

20832

Timer Clock

Source

SYSCLK

SYSCLK

SYSCLK

SYSCLK / 4

SYSCLK / 4

EXTCLK / 8

SYSCLK / 48

SYSCLK / 48

SCA1-SCA0

(pre-scale

select)*

XX

XX

XX

01

01

11

10

10

T1M* Timer 1

Reload

Value (hex)

1

0xCA

1

0x93

1

0x27

0

0x93

0

0x27

0

0x5D

0

0x93

0

0x27

57600

-0.47%

432

EXTCLK / 8

11

0

0xE5

28800

-0.47%

864

EXTCLK / 8

11

0

0xCA

14400

0.45%

1744

EXTCLK / 8

11

0

0x93

9600

0.15%

2608 EXTCLK / 8

11

0

X = Don’t care

*Note: SCA1-SCA0 and T1M bit definitions can be found in Section 23.1.

0x5D

284

Rev. 1.5

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