DEMO9S08QD4 Freescale Semiconductor, DEMO9S08QD4 Datasheet - Page 10

• Manufacturer Part Number: DEMO9S08QD4
• Description: BOARD DEMO FOR MC9S08QD FAMILY
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08QD4

• Contents: Board, Cable, CD
• Processor To Be Evaluated: MC9S08QD
• Data Bus Width: 8 bit
• Interface Type: USB
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08QD
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08QD2, MC9S08QD4
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Describing the Code
At the end of the subroutine, the flag
StateIdle
Established in
Current_position
the stepper motor. Positions are multiplied by four steps in this example. This can be customized in the
code as needed.
As established in
Required_Position
10
3.
4.
5.
6.
If the
If the
is bigger or smaller. This indicates if it needs to move forward or backwards.
If the
variables are equal.
—
If the
variables are equal.
—
routine is a counter to do a delay.
MOVE_STEPPER_FORWARD
MOVE_STEPPER_BACKWARDS
Required_Position
Required_Position
Required_Position
Required_Position
Table 1
If requiring fewer then four steps, obey
not miss the sequence, remember to store the last value in port A. Use the
last used value as the last step to generate the next step.
Driving a Stepper Motor Based on the MC9S08QD4 and Other 8-bit Families, Rev. 0
Table 1
PTAD=0x0A;
PTAD=0x09;
PTAD=0x05;
PTAD=0x06;
PTAD=0x00;
Current_position++;
) times. Each time the motor moves, the movement is composed of four small steps of
PTAD=0x0A;
PTAD=0x06;
PTAD=0x05;
PTAD=0x09;
PTAD=0x00;
Current_position--;
) times.
StateIdle();
StateIdle();
StateIdle();
StateIdle();
StateIdle();
StateIdle();
StateIdle();
StateIdle();
StateIdle();
StateIdle();
and
and
Figure
Figure 9
is smaller than the
is different than the
is bigger than the
is equal to the
9, the stepper motor moves forward (
subroutine:
subroutine: When the
Check
the stepper motor moves backwards (
is set.
When the
Current_position
Current_position
Current_position
NOTE
Current_position
Table 1
Check
Check
flag is set as
and
flag is set as
, the motor moves backwards until both
, the code goes to idle until
, then the motor moves forward until both
Figure 9
, it is important to check if the difference
Required_Position -
CHECKED
CHECKED
Current_position -
sequences. To
port A is set to:
, port A is set to:
Freescale Semiconductor
Idle_DONE
is set.