TMP88CS42FG Datasheet, PDF (138/216 Pages) Toshiba Semiconductor – 8 Bit Microcontroller

13. Motor Control Circuit (PMD: Programmable motor
driver)
TMP88CS42FG
SDREG
6 to 0
SDREG
Sampling delay
Set a time for which to stop sampling in order to prevent erroneous detection due to noise
that occurs immediately after PWM output turns on (immediately after the transistor turns
on). (Figure 13-5)
ON
PWM
OFF
Number of position
detection matches
0
(n = 5)
Match
PWMON period
Position detection
match
Sampling period
Sampling delay
Sampling pause
1234
Align the arrow to the start
of counter switching.
5
0
Figure 13-5 Position Detection Sampling Timing with the PWMON Period Selected
EMEM: Detects when a position detection match has occurred (the value is held aftr position detection).
(Check on whether sampling has started on the previous pulse)
EMEM value 11
ON
01
10
00
PWM _OFF
CASE1
CASE2
1
Match
(Sampling start)
0
1
11
A match with n = 5 means that it has
started on the previous pulse.
1
01
CASE3
CASE4
0
0
00
1
0
10
Erroneous
detection
Figure 13-6 Detection Timing of the Position Detection Position
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