Samsung S3F80JB manual Counter a Pulse Width Calculations, Method 2 When Caof =

Models: S3F80JB

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COUNTER A

S3F80JB

 

 

COUNTER A PULSE WIDTH CALCULATIONS

tLOW

tHIGH

tLOW

To generate the above repeated waveform consisted of low period time, tLOW, and high period time, tHIGH.

When CAOF = 0,

tLOW = (CADATAL + 2) 1/Fx. 0H < CADATAL < 100H, where Fx = the selected clock. tHIGH = (CADATAH + 2) 1/Fx. 0H < CADATAH < 100H, where Fx = the selected clock.

When CAOF = 1,

tLOW = (CADATAH + 2) 1/Fx. 0H < CADATAH < 100H, where Fx = the selected clock. tHIGH = (CADATAL + 2) 1/Fx. 0H < CADATAL < 100H, where Fx = the selected clock.

To make tLOW = 24 us and tHIGH = 15 us. fOSC = 4 MHz, FX = 4 MHz/4 = 1 MHz

[Method 1] When CAOF = 0,

tLOW = 24 us = (CADATAL + 2) / FX = (CADATAL + 2) x 1us, CADATAL = 22. tHIGH = 15 us = (CADATAH + 2) / FX = (CADATAH + 2) x 1us, CADATAH = 13.

[Method 2] When CAOF = 1,

tHIGH = 15 us = (CADATAL + 2) / FX = (CADATAL + 2) x 1us, CADATAL = 13. tLOW = 24 us = (CADATAH + 2) / FX = (CADATAH + 2) x 1us, CADATAH = 22.

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Page 265
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Samsung S3F80JB manual Counter a Pulse Width Calculations, Method 2 When Caof =