參數(shù)資料
型號(hào)： DRM041
英文描述： Building an USB-DDC ICP Interface Board HardwareReference Design
中文描述： 構(gòu)建的USB接口板DDC的備HardwareReference設(shè)計(jì)
文件頁(yè)數(shù)： 26/80頁(yè)
文件大?。?/td> 1025K
代理商： DRM041
Software
Designer Reference Manual
DRM040 — Rev 0
26
Software
MOTOROLA
push button switches. The first is the Display button which, when
pressed, toggles the display to the next position in the predefined
sequence. The display then remains active for 30secs with the new data
before reverting back to the original sequence that toggles every 5secs.
The second switch simulates opening the meter (tamper condition).
When open, a warning flag is displayed on the LCD and a time stamp is
calculated and stored in EEPROM. Additionally, a count is incremented
each time the meter is open and the value is stored in EEPROM. See
switch interface for additional details.
3.1 Software Routines
This section describes each function contained within the application
code. A general description and flow diagram are provided for each
routine.
3.1.1 Initialization
Individual routines are used to initialize the assembly and the ‘C’ code.
Both initialization routines, Asm_init and C_Init, primarily initialize the
variables and peripherals that are defined within the assembly and ‘C’
code respectively. However, C_Init is more complicated as it checks the
reset source, and if POR or LVI are set, assumes the initial power up
sequence (invalid RTC) as the backup batteries should prevent power
loss during normal operation. The RTC is initialized with default values
and the tariff switching times are stored in the Emulated EEPROM. If the
reset source was not POR or LVI the routine copies the saved RTC
registers (CopyRTC buffer) to the actual RTC modules registers. This is
necessary on the MC68HC908LJ12 as the reset signal resets all RTC
registers.
The last instruction within the function enables the global interrupt to
allow interrupts to occur within the application. The initialization flow
diagrams are shown in
Figure 3-1
.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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