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19  BUILT-IN I/O FUNCTION

19.3  Pulse Width Measurement Function

The list of special relays/special registers used in pulse width measurement is shown below.
R/W: Read or write (Note, however, that only writing is allowed for the HCMOV instruction.)
R: Read only

SM5020

CH1 pulse width measurement 
status flag

The measurement in progress/measurement stopped status of 
pulse width measurement on the target channel can be checked 
by these flags.
OFF: Measurement stopped
ON: Measurement in progress

OFF

R

SM5021

CH2 pulse width measurement 
status flag

SM5022

CH3 pulse width measurement 
status flag

SM5023

CH4 pulse width measurement 
status flag

SM5036

CH1 rising edge flag

These flags turn ON at the end of the 1st period measurement on 
the target channel. (They remain ON during measurement in the 
always measurement mode.)

OFF

R

SM5037

CH2 rising edge flag

SM5038

CH3 rising edge flag

SM5039

CH4 rising edge flag

SM5052

CH1 falling edge flag

These flags turn ON at the end of the 1st pulse width 
measurement on the target channel. (They remain ON during 
measurement in the always measurement mode.)

OFF

R

SM5053

CH2 falling edge flag

SM5054

CH3 falling edge flag

SM5055

CH4 falling edge flag

SM5068

CH1 measurement mode

The measurement mode of the target channel can be checked by 
these flags. (To change the measurement mode during operation, 
use this special relay.)
OFF: Always measurement mode
ON: 1 time measurement mode

ON

R/W

SM5069

CH2 measurement mode

SM5070

CH3 measurement mode

SM5071

CH4 measurement mode

SD5021, SD5020

CH1 rising edge ring counter value

The ring counter value when the rising edge is detected is stored.

00000000H

R/W

SD5023, SD5022

CH1 falling edge ring counter value

The ring counter value when the falling edge is detected is stored.

00000000H

R/W

SD5025, SD5024

CH1 pulse width latest value

The latest value of the pulse width is stored.

00000000H

R/W

SD5027, SD5026

CH1 pulse width maximum value

The maximum value of the pulse width is stored.

00000000H

R/W

SD5029, SD5028

CH1 pulse width minimum value

The minimum value of the pulse width is stored.

FFFFFFFFH

R/W

SD5031, SD5030

CH1 period latest value

The latest value of the period is stored.

00000000H

R/W

SD5033, SD5032

CH1 period maximum value

The maximum value of the period is stored.

00000000H

R/W

SD5035, SD5034

CH1 period minimum value

The minimum value of the period is stored.

FFFFFFFFH

R/W

SD5041, SD5040

CH2 rising edge ring counter value

The ring counter value when the rising edge is detected is stored.

00000000H

R/W

SD5043, SD5042

CH2 falling edge ring counter value

The ring counter value when the falling edge is detected is stored.

00000000H

R/W

SD5045, SD5044

CH2 pulse width latest value

The latest value of the pulse width is stored.

00000000H

R/W

SD5047, SD5046

CH2 pulse width maximum value

The maximum value of the pulse width is stored.

00000000H

R/W

SD5049, SD5048

CH2 pulse width minimum value

The minimum value of the pulse width is stored.

FFFFFFFFH

R/W

SD5051, SD5050

CH2 period latest value

The latest value of the period is stored.

00000000H

R/W

SD5053, SD5052

CH2 period maximum value

The maximum value of the period is stored.

00000000H

R/W

SD5055, SD5054

CH2 period minimum value

The minimum value of the period is stored.

FFFFFFFFH

R/W

SD5061, SD5060

CH3 rising edge ring counter value

The ring counter value when the rising edge is detected is stored.

00000000H

R/W

SD5063, SD5062

CH3 falling edge ring counter value

The ring counter value when the falling edge is detected is stored.

00000000H

R/W

SD5065, SD5064

CH3 pulse width latest value

The latest value of the pulse width is stored.

00000000H

R/W

SD5067, SD5066

CH3 pulse width maximum value

The maximum value of the pulse width is stored.

00000000H

R/W

SD5069, SD5068

CH3 pulse width minimum value

The minimum value of the pulse width is stored.

FFFFFFFFH

R/W

SD5071, SD5070

CH3 period latest value

The latest value of the period is stored.

00000000H

R/W

SD5073, SD5072

CH3 period maximum value

The maximum value of the period is stored.

00000000H

R/W

SD5075, SD5074

CH3 period minimum value

The minimum value of the period is stored.

FFFFFFFFH

R/W

SD5081, SD5080

CH4 rising edge ring counter value

The ring counter value when the rising edge is detected is stored.

00000000H

R/W

SD5083, SD5082

CH4 falling edge ring counter value

The ring counter value when the falling edge is detected is stored.

00000000H

R/W

SD5085, SD5084

CH4 pulse width latest value

The latest value of the pulse width is stored.

00000000H

R/W