Motorola M68HC08 - Manual (Page 78)

Software Design
Designer Reference Manual DRM028 — Rev 0
78 Software Design MOTOROLA
Figure 5-1. Main Data Flow — Part1
5.3.4 Process Fault Control Fault Stop
The process provides fault control and fault stop as described in Fault
State , Stand-By , Align State , 5.5.5 Back-EMF Acquisition State , and
Running State .
The processes alignment, starting, and running control are displayed in
Figure 5-2 . The processes are described in the following subsections.
5.3.5 Process Back, EMF Zero Crossing Sensing
Back-EMF zero crossing process provides:
• Back-EMF zero crossing sampling in synchronization with PWM,
START/STOP
PC Mode Start Ctrl Switch_Start Running
SWITCH
A/D CONVERTERS
Sp_Input
TIMER 1
VOLTAGE
Curr_Max_Fault Volt_Max_Fault
CURRENT
PC MASTER SOFTWARE
Stop_F
PCM COMMAND
FFLAG1 FFLAG2
PROCESS
ALIGNMENT, STARTING, RUNNING
CONTROL
START/STOP SWITCH READING
AND START/STOP DECISION
PROCESS
SPEED INPUT, DC-BUS VOLTAGE
AND DC-BUS CURRENT MEASUREMENT
PROCESS
FAULT CONTROL
FAULT STOP
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