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ST7DALI Datasheet(PDF) 75 Page - STMicroelectronics

Part No. ST7DALI
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7DALI
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DALI COMMUNICATION MODULE (Cont’d)
In the example shown in Figure 44, the DCMC-
SR[3:0] bits are updated automatically at each
edge trigger (DALI signal change of phase). At the
same time the value of the 4-bit sample clock
counter is reset. By reading the DCMCSR[3:0] bits
software can detect changes in the DALI signal
pulse length.
Figure 44. Example of DALI Signal Sampling
DALI Signal
Edge Trigger
tCPU
tCPU
tCPU
4-bit sample
clock counter
(/16 divider)
0000
0001
1111
0000
xxxx
0000
0000
1111
xxxx
DCMCSR[3:0]
bits
tCPU= f
CPU
m
1
m = (DCMCLK integer value+1) x tCPU
fDALI= 1.2 kHz
N = 207 (DCMCLK)
fCPU= 8 MHz
tCPU = 125ns
m = 26 µs (208 x 125ns)
Example:
Legend:
833.33µs
1




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