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S3C8248/C8245/P8245/C8247/C8249/P8249
TIMER B PULSE WIDTH CALCULATIONS
To generate the above repeated waveform consisted of low period time, t
When TBOF = 0,
t
= (TBDATAL + 2) x 1/fx, 0H < TBDATAL < 100H, where fx = The selected clock.
LOW
t
= (TBDATAH + 2) x 1/fx, 0H < TBDATAH < 100H, where fx = The selected clock.
HIGH
When TBOF = 1,
t
= (TBDATAH + 2) x 1/fx, 0H < TBDATAH < 100H, where fx = The selected clock.
LOW
t
= (TBDATAL + 2) x 1/fx, 0H < TBDATAL < 100H, where fx = The selected clock.
HIGH
To make t
= 24 us and t
LOW
When TBOF = 0,
t
= 24 us = (TBDATAL + 2) /fx = (TBDATAL + 2) x 1us, TBDATAL = 22.
LOW
t
= 15 us = (TBDATAH + 2) /fx = (TBDATAH + 2) x 1us, TBDATAH = 13.
HIGH
When TBOF = 1,
t
= 15 us = (TBDATAL + 2) /fx = (TBDATAL + 2) x 1us, TBDATAL = 13.
HIGH
t
= 24 us = (TBDATAH + 2) /fx = (TBDATAH + 2) x 1us, TBDATAH = 22.
LOW
t
LOW
= 15 us. f
= 4 MHz, fx = 4 MHz/4 = 1 MHz
HIGH
OSC
t
HIGH
t
LOW
LOW
8-BIT TIMER A/B
, and high period time, t
.
HIGH
11-7
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