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| 型號(hào)： | C16X |
| 廠商： | SIEMENS AG |
| 元件分類： | 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） |
| 文件頁數(shù)： | 11/40頁 |
| 文件大小： | 460K |
| 代理商： | C16X |
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Using the
SSC (SPI) Interface in a Multimaster System
Semiconductor Group
11 of 40
AP1632 06.96
nterrupt service routine
RX_INT
because PEC0 counter has been decremented to 0. If
the command
DIR_CHG
is decoded, the SSC receive interrupt is then directed to PEC2
which will transfer 16 consecutive words from the SSCRB to the
RX_BUFFER
. After that,
RX_INT
is called again (PEC2 counter = 0) and the SSC receive interrupt is redirected to
PEC0 to prepare receiving of the next word.
Depending on the received command, several actions will take place as shown in the
diagram in Fig. 6.
For the code listing of
RX_INT
refer to chapter 4.1.7.
3.6
Running LED light
The running LED light is controlled by the interrupt service routine RUNLIGHT which is
called each time after an Timer5 overflow has occurred, that means, after the delay time
for a LED left or right step is passed. The current LED status is obtained from a global
variable, rotated to the right or to the left depending on the direction variable and written
back to the global variable and to Port2 where the LEDs are connected to. Because
Timer5 is not capable of self reload, the Timer5 control and timer registers have to be
reloaded to feature the appropriate delay time and restart of the timer. For a graphical
description see fig. 7, the C code of the routine RUNLIGHT.C can be found in chapter
4.1.5.
Figure 9:
Timer 5 interrupt service routine for running LED light
m ask
16 bit
reload Tim er5 register
(Tim er5 continues counting)
16 LEDs incl. resistors
1 bit LEFT rotated BITM ASK
1 bit RIGHT rotated BITM ASK
16 bit
m ask
BITM ASK (global variable)
16 bit
BITM ASK
m ask (local variable)
16 bit
BITM ASK
Ti er5 egiter verfow auses
Ti er5 nterrupt > tart fiterrupt
servie outie
T5 Ti er5 egiter)
1
16 i
1
1
1
1
1
1
1
1
1
1
P2 (Port2 register)
16 bit
new BITM ASK
. . .
DIR (global variable)
= 1
= 0
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