HT69F360 datasheet(171/235 Pages) HOLTEK

171 / 235 page

Rev. 1.30

170

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Rev. 1.30

171

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HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

HT69F340/HT69F350/HT69F360

TinyPowerTM I/O Flash MCU with LCD & EEPROM

Calculating the register and error values

Foraclockfrequencyof4MHz,andwithBRGHsetto“0”determinetheBRGregistervalueN,the

actualbaudrateandtheerrorvalueforadesiredbaudrateof4800.

FromtheabovetablethedesiredbaudrateBR=fSYS/[64(N+1)]

Re-arrangingthisequationgivesN=[fSYS/(BR×64)]-1

GivingavalueforN=[4000000/(4800×64)]-1=12.0208

Toobtaintheclosestvalue,adecimalvalueof12shouldbeplacedintotheBRGregister.Thisgives

anactualorcalculatedbaudratevalueofBR=4000000/[64×(12+1)]=4808

Thereforetheerrorisequalto(4808-4800)/4800=0.16%

ThefollowingtablesshowactualvaluesofbaudrateanderrorvaluesforthetwovaluesofBRGH.

Baud Rate

K/BPS

Baud Rates for BRGH=0

fSYS=16 MHz

BRG

Kbaud

Error (%)

0.3

—

1.�

�07

1.�0�

0.1�

�.4

103

�.404

0.1�

4.�

4.�0�

0.1�

9.�

�5

9.�15

0.1�

19.�

1�

19.�31

0.1�

3�.4

�

35.714

-�.99

57.�

��.5

�.51

115.�

1�5

�.51

�50

Baud Rates and Error Values for BRGH=0

Baud Rate

K/BPS

Baud Rates for BRGH=1

fSYS=16 MHz

BRG

Kbaud

Error (%)

0.3

—

1.�

—

�.4

—

4.�

�07

4.�0�

0.1�

9.�

103

9.�15

0.1�

19.�

19.�31

0.1�

3�.4

�5

3�.4��

0.1�

57.�

1�

5�.��4

�.1�

115.�

�

111.11

-3.55

�50

Baud Rates and Error Values for BRGH=1

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