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参数资料
| 型号： | C16X |
| 厂商： | SIEMENS AG |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-Bit Microcontroller(8位微控制器) |
| 中文描述： | 8位微控制器（8位微控制器） |
| 文件页数： | 5/40页 |
| 文件大小： | 460K |
| 代理商： | C16X |
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Using the
SSC (SPI) Interface in a Multimaster System
Semiconductor Group
5 of 40
AP1632 06.96
Figure 3:
Functions of the LED display in different operating modes
3
SSC demo software
The software is divided into several modules each performing very specific actions
described in the following sections.
3.1
Main program
Because the software is event-controlled (interrupts), the main program consist only of a
system initialization routine call and a loop containing the IDLE instruction. Each time
IDLE is executed the CPU is powered down while all peripherals like timers remain
running. This state is held until an interrupt occurs (e.g. from SSC scan, running LED).
After executing the system initialization all used state variables and on-chip devices like
timers, PEC and SSC are configured. See also chapter 3.2 and 4.1.1.
3.2
System initialization
The system initialization routine
INIT_SYS
is executed only once during start-up and
performs initialization of global variables and loading of the configuration registers of the
used on-chip peripherals. These devices are configured as following:
Port2 to output for driving the LED display
Timer2 to 50 ms, used in master mode to provide all slave boards periodically with SSC
clock
Timer5 to 50 ms, used in slave mode for the running LED pattern (one shift per timer
overflow)
Timer0 as counter for P3.0 to detect pushed key
PEC0 to transfer one word from SSC receive buffer to receive data buffer in memory
PEC2 to transfer 16 words from SSC receive buffer to auto-incremented receive data
buffer location in memory
SSC with fixed baudrate as defined in the C header file SSC.H
SSC to slave move (see also chapter 3.3)
For the code listing of
INIT_SYS.C
see 4.1.2.
OR
START UP
M ASTER M ODE
SLAVE M ODE
P2.0
P2.15
1 2 4 8
Board ID
P2.0
P2.15
P2.0
P2.15
1 2 4 8
Board ID + num ber = ID of rem ote board
LED...
depending on ID/state
on
off
flashing
running
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