Counter A Pulse Width Calculations - Samsung S3F80JB User Manual

COUNTER A

COUNTER A PULSE WIDTH CALCULATIONS

To generate the above repeated waveform consisted of low period time, t
When CAOF = 0,
= (CADATAL + 2) × 1/Fx. 0H < CADATAL < 100H, where Fx = the selected clock.
t
LOW
= (CADATAH + 2) × 1/Fx. 0H < CADATAH < 100H, where Fx = the selected clock.
t
HIGH
When CAOF = 1,
= (CADATAH + 2) × 1/Fx. 0H < CADATAH < 100H, where Fx = the selected clock.
t
LOW
= (CADATAL + 2) × 1/Fx. 0H < CADATAL < 100H, where Fx = the selected clock.
t
HIGH
To make t = 24 us and t
LOW
[Method 1] When CAOF = 0,
t = 24 us = (CADATAL + 2) / FX = (CADATAL + 2) x 1us, CADATAL = 22.
LOW
t = 15 us = (CADATAH + 2) / FX = (CADATAH + 2) x 1us, CADATAH = 13.
HIGH
[Method 2] When CAOF = 1,
t = 15 us = (CADATAL + 2) / FX = (CADATAL + 2) x 1us, CADATAL = 13.
HIGH
t = 24 us = (CADATAH + 2) / FX = (CADATAH + 2) x 1us, CADATAH = 22.
LOW
12-4
t
LOW
= 15 us. f = 4 MHz, FX = 4 MHz/4 = 1 MHz
HIGH OSC
t
HIGH
t
LOW
, and high period time, t
LOW
S3F80JB
HIGH.