ST7FDALI View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7FDALI

8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI

STMicroelectronics 

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ST7DALI

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

833.33µs

DALI Signal

Edge Trigger

tCPU

tCPU

tCPU

4-bit sample

clock counter

(/16 divider)

m

0000 0001

1111 0000

xxxx 0000

DCMCSR[3:0]

bits

0000

Legend:

1

tCPU= fCPU

m = (DCMCLK integer value+1) x tCPU

Example:

fDALI= 1.2 kHz

fCPU= 8 MHz

N = 207 (DCMCLK)

tCPU = 125ns

1111

m = 26 µs (208 x 125ns)

xxxx

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