mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 307

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
No
Advance Pointer
Start Integration
Start Blanking
Initialize SSD
Disable SSD
Integration?
Detection?
Blanking?
End of
End of
Stall
Yes
Yes
Yes
No
No
Figure 10-15. Return-to-Zero Flowchart
MC9S12HZ256 Data Sheet, Rev. 2.05
Using Motor Control module, drive pointer to within 3 full steps of
calibrated zero position.
1. Clear (or set) RCIR; clear (or set) POL; clear (or set) SMS;
2. Set MCZIE; clear MODMC; clear (or set) PRE; set MCEN.
3. Set RTZE; set SDCPU; write ACLKS (select sample frequency).
4. Store threshold value in RAM.
1. Clear MCZIF.
2. Write MDCCNT with blanking time value.
3. Clear ITG; clear (or set) DCOIL; increment (or decrement) STEP for
CCW (or CW) motion.
MDCCNT = 0x0000? or MCZIF = 1?
1. Clear MCZIF.
2. Write MDCCNT with integration time value.
3. Set ITG; set DCOIL.
MDCCNT = 0x0000? or MCZIF = 1?
ITGACC < Threshold (RAM value)?
1. Clear MCZIF.
2. Clear MCEN.
3. Clear ITG.
4. Clear RTZE; clear SDCPU.
Chapter 10 Stepper Stall Detector (SSDV1)
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