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Chapter 8 High-speed counter, PWM / Pulse train output and Analogue I/O
8-11
(2) Phase counting mode 1
In this mode the counter counts at the rising edge of input 1A. At this point, if input 1B is 0 (Low) it counts up, and if
input 1B is 1 (High) it counts down.
Figure 8.15 Counting operation of phase counting mode 1
Input 1A Input 1B Operation
1 (High)
↑ (Rising edge)
Do not count
0 (Low)
↓ (Falling edge)
↓ (Falling edge)
1 (High)
↑ (Rising edge)
0 (Low) Up count
0 (Low)
↑ (Rising edge)
Do not count
1 (High)
↓ (Falling edge)
↓ (Falling edge)
0 (Low)
↑ (Rising edge)
1 (High) Down count
(3) Phase counting mode 2
In this mode, if input 1B is 0 (Low) at the rising edge of input 1A the counter counts up, and if input 1A is 0 (Low) at the
rising edge of input 1B, the counter counts down.
Figure 8.16 Counting operation of phase counting mode 2
Input 1A Input 1B Operation
1 (High)
↑ (Rising edge)
Do not count
0 (Low)
↓ (Falling edge)
↓ (Falling edge)
1 (High)
↑ (Rising edge)
0 (Low) Up count
0 (Low)
↑ (Rising edge)
Down count
1 (High)
↓ (Falling edge)
Do not count
↓ (Falling edge)
0 (Low)
↑ (Rising edge)
1 (High)
Coincidence
output
On
p
reset
Off
p
reset
Count value
Input 1B
Input 1A
Coincidence
output
On
p
reset
Off
p
reset
Count
value
Input 1B
Input 1A