Chapter 17 Stepper Stall Detector (SSDV2) Block Description
S12ZVHY/S12ZVHL Family Reference Manual Rev. 1.05
Freescale Semiconductor
631
underflow. The FLMC bit in the MDCCTL register can be used to immediately update the count register
with the new value if an immediate load is desired.
The modulus down counter clock frequency is the bus frequency divided by 64 or 512.
17.3.2.6
Integration Accumulator Register (ITGACC)
Read: anytime.
Write: Never.
NOTE
A separate read for high byte and low byte gives a different result than
accessing the register as a word.
This 16-bit field is signed and is represented in two’s complement. It indicates the change in flux while
integrating the back EMF present in the non-driven coil during a return to zero event.
When ITG is zero, the accumulator is initialized to 0x0000 and the sigma-delta converter is in a reset state.
When ITG is one, the accumulator increments or decrements depending on the sigma-delta conversion
sample. The accumulator sample frequency is determined by the ACLKS field. The accumulator freezes
at 0x7FFF on a positive overflow and freezes at 0x8000 on a negative overflow.
17.4
Functional Description
The stepper stall detector (SSD) has a simple control block to configure the H-bridge drivers of a stepper
motor in four different full step states with four available modes during a return to zero event. The SSD
has a detect circuit using a sigma-delta converter to measure and integrate changes in flux of the de-
energized winding in the stepping motor and the conversion result is accumulated in a 16-bit signed
register. The SSD also has a 16-bit modulus down counter to monitor blanking and integration times. DC
offset compensation is implemented when using the modulus down counter to monitor integration times.
Module Base + 0x0006
15
14
13
12
11
10
9
8
R
ITGACC
W
Reset
0
0
0
0
0
0
0
0
Figure 17-8. Integration Accumulator Register High (ITGACC)
Module Base + 0x0007
7
6
5
4
3
2
1
0
R
ITGACC
W
Reset
0
0
0
0
0
0
0
0
Figure 17-9. Integration Accumulator Register Low (ITGACC)
Содержание MC9S12ZVHL32
Страница 21: ...S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 21 PAGE INTENTIONALLY LEFT BLANK...
Страница 22: ...S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 22 Freescale Semiconductor PAGE INTENTIONALLY LEFT BLANK...
Страница 686: ...Chapter 20 ECC Generation module SRAM_ECCV1 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 686 Freescale Semiconductor...
Страница 752: ...Chapter 22 Supply Voltage Sensor BATSV2 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 752 Freescale Semiconductor...
Страница 774: ...Chapter 23 LIN Physical Layer S12LINPHYV2 S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 774 Freescale Semiconductor...
Страница 788: ...Appendix A MCU Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 788 Freescale Semiconductor...
Страница 794: ...Appendix B ADC Electricals S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 794 Freescale Semiconductor...
Страница 798: ...Appendix D IRC Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 798 Freescale Semiconductor...
Страница 802: ...Appendix F MSCAN Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 802 Freescale Semiconductor...
Страница 806: ...Appendix G NVM Electrical Parameters S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 806 Freescale Semiconductor...
Страница 810: ...Appendix H BATS Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 810 Freescale Semiconductor...
Страница 816: ...Appendix K OSC32K Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 816 Freescale Semiconductor...
Страница 822: ...Appendix L SPI Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 822 Freescale Semiconductor...
Страница 826: ...Appendix M LINPHY Electrical Specifications S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 826 Freescale Semiconductor...
Страница 829: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 830 Freescale Semiconductor O 1 144 LQFP...
Страница 830: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 831...
Страница 831: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 832 Freescale Semiconductor...
Страница 832: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 833 O 2 100 LQFP...
Страница 833: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 834 Freescale Semiconductor...
Страница 834: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 Freescale Semiconductor 835...
Страница 835: ...Appendix O Package Information S12ZVHY S12ZVHL Family Reference Manual Rev 1 05 836 Freescale Semiconductor...