參數(shù)資料
型號(hào)： DRM010
英文描述： Vacuum Cleaner Designer Reference Manual
中文描述： 吸塵器設(shè)計(jì)參考手冊(cè)
文件頁(yè)數(shù)： 28/72頁(yè)
文件大?。?/td> 1177K
代理商： DRM010
Vacuum Cleaner Reference Design
Designer Reference Manual
DRM010 — Rev 0
28
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
HC08 has stack manipulation instructions that permit the C compiler to
effectively use local variables and minimize the RAM requirements. The
HC08 also provides very good code efficiency due to the short
instruction length. The HC908KX8 has eight Kbytes of FLASH memory,
more than enough for a small program. The phase angle control
software takes only about 1.2 Kbytes of program memory. Even a small
1.5-k part might be programmed in C if no complex math or library
functions are included. For this project, the HIWARE C compiler was
used to produce compact code comparable in code size to a hand-coded
assembler in many instances.
The software can be organized in several different ways. For example,
the code could be written as a straightforward procedure using polling.
When using polling, the software would test or poll the zero crossing pin
and wait for a zero crossing. This is the preferred method when using a
small HC05 MCU with limited peripherals. Using an HC08 with a
2-channel timer, the software can be written using interrupts. This
provides more time for the CPU to perform other functions.
Once the MCU has been initialized, all processing could be done in
interrupt service routines. This is a common method of organizing
software. The main procedure would end with a while(1) statement and
all processing is handled by the ISRs (interrupt service routine).
The zero crossing and triac pulses are time critical events and are best
handled by the hardware timers and serviced using interrupts. Other
functions are not time critical and could be performed anywhere in the ac
cycle.
The control loop functions such as reading the ADC, scaling, integrating,
and saturation are not time critical. These functions can be placed in the
main loop. The interrupt service routines will interrupt the calculations as
needed. A mechanism is then needed to synchronize these functions to
the ac line. A sync flag is used for this purpose. The main loop will wait
for the sync flag before updating the phase. The input capture routine will
set the sync flag, enabling the main loop functions. The main loop will
then update the phase information and clear the sync flag.
The resulting flowchart is shown in
Figure 1-11
. This is a combined
flowchart and state diagram.
F
Freescale Semiconductor, Inc.
n
.
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