Sensor Mode; Event Counter; Figure 3.3 3-Phase Decode ([Enxtncr]<P3En>=1) - Toshiba TXZ Series Reference Manual

3.2.2. Sensor Mode

The low-speed position sensor (Zero-cross judgment) is supported to use 2-phase hall sensor input and 3-phase
hall sensor input. There are three sensor modes, Event count mode, Timer count mode, and Phase count mode.
In the timer count mode and the phase count mode, when PMD circuit drives BLDC motor with the pulse signal,
the zero cross detection of the induced voltage can be supported using PWM synchronous sampling. (BEMF
detection control)

3.2.2.1. Event Counter

The count is done by the rotation edge detection.
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Using the rotation edge detection, a division pulse and an interrupt can be generated.
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Using the rotation edge pulse count, an interrupt can be generated at any counter value.
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Rotation direction judgment
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32-bit up- and down-count (controlled by the rotation direction judgment)
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The setting of the detected rotation direction is available.
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Abnormal state detection flag
(1) 3-phase decode ([ENxTNCR]<P3EN>=1)
In the case of [ENxINT]=0x00000002;
fsys
ENCxA(U)
ENCxB(V)
ENCxZ(W)
Rotation edge pulse ENCLK
DIR
Rotation direction
Count clear
ENCxTIMPLS
(2-division)
Counter
Interrupt INTENCx1
2018-10-11
CW direction
0xFFFF 0xFFFF 0xFFFF 0xFFFF 0x0000
FFFC FFFD FFFE FFFF 0000
Figure 3.3 3-phase decode ([ENxTNCR]<P3EN>=1)
Advanced Encoder Input Circuit(32-bit)
0x0000 0x0000 0x0000 0x0000
0001 0002 0003 0002
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CCW direction
0x0000 0x0000 0xFFFF 0xFFFF 0xFFFF
0001 0000 FFFF FFFE FFFD
TXZ Family
0xFFFF 0xFFFF 0xFFFF
FFFC FFFB FFFA
Rev. 1.1