Samsung S3P80C5 User Manual page 241

COUNTER A
COUNTER A PULSE WIDTH CALCULATIONS
To generate the above repeated waveform consisted of low period time, t
When CAOF = 0,
t
LOW
t
HIGH
When CAOF = 1,
t
LOW
t
HIGH
To make t = 24 us and t
LOW
[Method 1] When CAOF = 0,
= 24 us = (CADATAL + 2) /fx = (CADATAL + 2) × 1us, CADATAL = 22.
t
LOW
= 15 us = (CADATAH + 2) /fx = (CADATAH + 2) × 1us, CADATAH = 13.
t
HIGH
[Method 2] When CAOF = 1,
= 15 us = (CADATAL + 2) /fx = (CADATAL + 2) × 1us, CADATAL = 13.
t
HIGH
= 24 us = (CADATAH + 2) /fx = (CADATAH + 2) × 1us, CADATAH = 22.
t
LOW
12-4
Counter A Data High-Byte Register (CADATAH)
MSB .7 .6 .5
Counter A Data Low-Byte Register (CADATAL)
MSB .7 .6 .5
Figure 12-3. Counter A Registers
t
LOW
= (CADATAL + 2) x 1/fxx, 0H < CADATAL < 100H, where fx = The selected clock.
= (CADATAH + 2) x 1/fxx, 0H < CADATAH < 100H, where fx = The selected clock.
= (CADATAH + 2) x 1/fxx, 0H < CADATAH < 100H, where fx = The selected clock.
= (CADATAL + 2) x 1/fxx, 0H < CADATAL < 100H, where fx = The selected clock.
= 15 us. f
HIGH OSC
F4H, Set 1, R/W
.4 .3 .2
Reset Value : FFh
F5H, Set 1, R/W
.4 .3 .2
Reset Value : FFh
t
HIGH
t
LOW
= 4 MHz, fx = 4 MHz/4 = 1 MHz
S3P80C5/C80C5/C80C8
.1 .0 LSB
.1 .0 LSB
, and high period time, t
LOW
.
HIGH