HT45F65 datasheet(195/231 Pages) HOLTEK

195 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

Calculating the Baud Rate and Error Values

Foraclockfrequencyof4MHz,andwithBRGHsetto0determinetheBRGregistervalueN,the

actualbaudrateandtheerrorvalueforadesiredbaudrateof4800.

FromtheabovetablethedesiredbaudrateBR=

)]

(

[



SYS

Re-arrangingthisequationgivesN=

)

(





SYS

GivingavalueforN=

0208

)

4800

(

4000000







Toobtaintheclosestvalue,adecimalvalueof12shouldbeplacedintotheBRGregister.Thisgives

anactualorcalculatedbaudratevalueofBR=

4808

)]

(

[

4000000 



Thereforetheerrorisequalto

4800

4808 

=0.16%

Thefollowingtablesshowtheactualvaluesofbaudrateanderrorvaluesforthetwovalueof

BRGH.

Baud

Rate

K/BPS

Baud Rates for BRGH=0

fSYS=4MHz

fSYS=3.579545MHz

fSYS=7.159MHz

BRG

Kbaud

Error(%)

BRG

Kbaud

Error(%)

BRG

Kbaud

Error(%)

0.3

�07

0.300

0.16

18�

0.300

0.00

—

1.�

�1

1.�0�

0.16

�6

1.190

-0.83

9�

1.�03

0.�3

�.�

��

�.�0�

0.16

��

�.�3�

1.3�

�6

�.380

-0.83

�.8

1�

�.808

0.16

�.661

-�.90

��

�.863

1.3�

9.6

8.9�9

-6.99

�

9.3�1

-�.90

9.3��

-�.90

19.�

�

�0.833

8.�1

�

18.6�3

-�.90

�

18.6�3

-�.90

38.�

—

�

3�.�86

-�.90

�7.6

6�.�00

8.�1

��.930

-�.90

��.930

-�.90

11�.�

—

111.8�9

-�.90

Baud Rates and Error Values for BRGH=0

Baud

Rate

K/BPS

Baud Rates for BRGH=1

fSYS=4MHz

fSYS=3.579545MHz

fSYS=7.159MHz

BRG

Kbaud

Error(%)

BRG

Kbaud

Error(%)

BRG

Kbaud

Error(%)

0.3

—

1.�

�07

1.�0�

0.16

18�

1.�03

0.�3

—

�.�

103

�.�0�

0.16

9�

�.�06

0.�3

18�

�.�06

0.�3

�.8

�1

�.808

0.16

�6

�.76

-0.83

9�

�.811

0.�3

9.6

��

9.61�

0.16

��

9.7�7

1.3�

�6

9.��0

-0.83

19.�

1�

19.�31

0.16

18.6�3

-�.90

��

19.��

1.3�

38.�

3�.71�

-6.99

�

37.�86

-�.90

37.�86

-�.90

�7.6

6�.�

8.�1

��.930

-�.90

��.930

-�.90

11�.�

1��

8.�1

111.86

-�.90

111.86

-�.90

��0

—

Baud Rates and Error Values for BRGH=1

HT45F65 Datasheet(PDF) 195 Page - Holtek Semiconductor Inc

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