Motorola M68HC08 Sys3Def, Process Measurement, Start/Stop Switch Reading and Start/Stop Decision

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Software Design

Data Flow

Type: S8- signed 8 bit, U8- unsigned 8 bit, S16- signed 16bit, U16- unsigned 16bit, (union)- 16 bits access or 2*8bit access

The system registers Sys1 flags are described by definitions of

Sys3_Def:

typedef union
{
struct
{
unsigned int PC_F	: 1;	/* BIT0 Phase Commutation Flag */
unsigned int Off_F	: 1; /* BIT1 Offset timeout flag
	- Offset timeout can be measured */
unsigned int ICR_F	: 1;	/* BIT2 Input Capture
		was succesfuly Received - Flag */
unsigned int Rmp_F	: 1;	/* BIT3 Speed Ramp Flag - motor
ramping */
unsigned int Stop_F	: 1;	/* BIT4 Motor is going or is
stopped */
unsigned int Strt_F	: 1; /* BIT5 Start Phase Flag */
unsigned int Run_F	: 1; /* BIT6 Motor Running with
		back-EMF feedback Flag */
unsigned int FOK_F	: 1;	/* BIT7 Feedback within the righ
time Flag */
} B;
/*

FOK_FRun_FStrt_FStop_FRmp_FICR_FOff_FPC_F */ char R;

} Sys1_Def; /* System register #1 Definition */

Main data flow is displayed in Figure 5-1. The processes are described in the following subsections.

5.3.2 Process Measurement

The process provides measurement of analog values using ADC. The measured inputs are: dc-bus current, dc-bus voltage, and speed input. The measurement is provided by the measurement handler. The state diagram is explained in State Diagram.

5.3.3 Start/Stop Switch Reading and Start/Stop Decision

The process reads the start stop switch and provides start condition and clear failure decisions, as explained in Stand-Byand Fault State.

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	Software Design	77
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