tmp89fm82 TOSHIBA Semiconductor CORPORATION, tmp89fm82 Datasheet - Page 301

• Manufacturer Part Number: tmp89fm82
• Description: 8 Bit Microcontroller Tlcs-870/c1 Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA000
19.3
port. Applied to this position signal input port is the voltage status of the motor windings for the case of sensorless
DC motors or a Hall element signal for the case of DC motors with sensors included. The expected patterns corre-
sponding to specific rotor positions are set in the PMD Output Register (MDOUT) beforehand, and when the input
position signal and the expected value match during rotor rotation, a position detect interrupt (INTPDC) is generated.
Also, unmatch detect mode is available to detect the direction of motor rotation, i.e. when the status of the position
detect input port changes from that of sampling start, a position detection interrupt is generated.
the timing chart in Figure 19-3. Once a predicted position signal pattern is set in the MDOUT register, a position detect
interrupt is generated the moment the position signal input PDU,PDV,PDW match this expected value. The position
signals are internal signals which cannot be observed from the outside.
The Position Detection Unit identifies the motor's rotor position from input patterns on the position signal input
For three-phase brushless DC motors, there are six patterns of position signals, as summarized in Table 19-2 from
Position Detection Unit
Table 19-2 Position Signal Input Patterns
Detection Mode
Position
Mode 0
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
U Phase (PDU)
H
H
H
L
L
L
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V Phase (PDV)
H
H
H
L
L
L
W Phase (PDW)
H
H
H
L
L
L
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