Справочник Пользователя для Freescale Semiconductor Demonstration Board for Freescale MC9S12XHY256 Microcontroller DEMO9S12XHY256 DEMO9S12XHY256
Модели
DEMO9S12XHY256
Stepper Stall Detector (SSDV1) Block Description
MC9S12XHY-Family Reference Manual, Rev. 1.04
Freescale Semiconductor
703
21.3.2.1
Return-to-Zero Control Register (RTZCTL)
Read: anytime
Write: anytime
Module Base + 0x0000
7
6
5
4
3
2
1
0
R
ITG
DCOIL
RCIR
POL
0
SMS
STEP
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 21-2. Return-to-Zero Control Register (RTZCTL)
Table 21-3. RTZCTL Field Descriptions
Field
Description
7
ITG
Integration — During return to zero (RTZE = 1), one of the coils must be recirculated or non-driven determined
by the STEP field. If the ITG bit is set, the coil is non-driven, and if the ITG bit is clear, the coil is being recirculated.
by the STEP field. If the ITG bit is set, the coil is non-driven, and if the ITG bit is clear, the coil is being recirculated.
shows the condition state of each transistor from
based on the STEP, ITG, DCOIL and
RCIR bits.
Regardless of the RTZE bit value, if the ITG bit is set, one end of the non-driven coil connects to the (non-zero)
reference input and the other end connects to the integrator input of the sigma-delta converter. Regardless of
the RTZE bit value, if the ITG bit is clear, the non-driven coil is in a blanking state, the converter is in a reset state,
and the accumulator is initialized to zero.
reference input and the other end connects to the integrator input of the sigma-delta converter. Regardless of
the RTZE bit value, if the ITG bit is clear, the non-driven coil is in a blanking state, the converter is in a reset state,
and the accumulator is initialized to zero.
shows the condition state of each switch from
based on the ITG, STEP and POL bits.
0 Blanking
1 Integration
0 Blanking
1 Integration
6
DCOIL
Drive Coil — During return to zero (RTZE=1), one of the coils must be driven determined by the STEP field. If
the DCOIL bit is set, this coil is driven. If the DCOIL bit is clear, this coil is disconnected or drivers turned off.
the DCOIL bit is set, this coil is driven. If the DCOIL bit is clear, this coil is disconnected or drivers turned off.
shows the condition state of each transistor from
based on the STEP, ITG, DCOIL and
RCIR bits.
0 Disconnect Coil
1 Drive Coil
0 Disconnect Coil
1 Drive Coil
5
RCIR
Recirculation in Blanking Mode — During return to zero (RTZE = 1), one of the coils is recirculated prior to
integration during the blanking period. This bit determines if the coil is recirculated via VDDM or via VSSM.
integration during the blanking period. This bit determines if the coil is recirculated via VDDM or via VSSM.
shows the condition state of each transistor from
based on the STEP, ITG, DCOIL and
RCIR bits.
0 Recirculation on the high side transistors
1 Recirculation on the low side transistors
0 Recirculation on the high side transistors
1 Recirculation on the low side transistors
4
POL
Polarity — This bit determines which end of the non-driven coil is routed to the sigma-delta converter during
conversion or integration mode.
conversion or integration mode.
shows the condition state of each switch from
based on
the ITG, STEP and POL bits.