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ST7DALI Datasheet(PDF) 70 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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11.4 DALI COMMUNICATION MODULE
11.4.1 Introduction
The DALI Communication Module (DCM) is a seri-
al communication circuit designed for controllable
electronic ballasts. Ballasts are the devices used
to provide the required starting voltage and operat-
ing current for fluorescent, mercury, or other elec-
tric-discharge lamps. The DCM supports the DALI
(Digital Addressable Lighting Interface) communi-
cations standard (IEC standard).
11.4.2 Main Features
– 8-bit forward address register for addressing
up to 64 digital ballasts
– 1.2 kHz transmission rate ±10%
– 8-bit forward and backward data registers for
bi-directional communications
– Maskable interrupt
Figure 41. Dali Communication Module Block Diagram
Note: The 4-bit preshift register is always active,
except when in Halt mode or if the DCME bit = 0.
16-bit Shift Register
1/16
1/N
8-bit DCMCLK
8-bit DCMFA
8-bit DCMFD
8-bit DCMBD
DALIOUT
DALIIN
Arbitration &
Error Detection
8
8
8
4-bit Pre-shift
fCPU
CK0
CK1
CK2
CK3
RTF
EF
ITF
ITE
FTS
RTS
RTA
DCME
0
0
0
0
fCPU
DCMCSR
DCMCR
DCM Interrupt Request
Register
Register
Register
Register
Edge
Detector
Register
Register
Register
fDALI
4-bit sample
clock counter
1




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