ST7DALI datasheet(73/141 Pages) STMICROELECTRONICS

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ST7DALI

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DALI COMMUNICATION MODULE (Cont’d)

11.4.6 Special Functions

11.4.6.1 Forced Transmission (Test mode)

The DCM must receive a "forward frame" before

sending back a "backward frame". But it is possi-

ble to force the DCM into Transmit state by setting

the FTS bit in the DCMCR register. The DCMBD

Significant Bit-first. Preferably before forcing the

DCM into Transmit state, the user should reset/set

the DCME bit in the DCMCR register. An interrupt

flag will be generated after a forced transmission

(the ITF bit in the DCMCSR register).

Procedure:

– Reset the DCME bit in the DCMCR register.

– Write the backward value in the DCMBD reg-

ister.

– Set both the DCME and the FTS bits in the

DCMCR register.

– When an interrupt is generated (end of trans-

mission, the ITF bit is set in the DCMCSR reg-

ister), set the RTA bit in the DCMCR register

to re-start a transmission.

– To return to normal DALI communications, re-

set/set the DCME bit and reset the FTS bit in

the DCMCR register.

11.4.6.2 Normal Transmission

After the "forward frame" reception, the software

must write the backward data byte to the DCMBD

DCMCR register to start the transmission.

It is not possible to send a backward frame just af-

ter having sent a backward frame (see DALI

standard protocol).

11.4.6.3 DCM Enable

The user can enable or disable the DCM by writing

the DCME bit in the DCMCR register. This bit is

also used to reset the entire internal finite state

machine.

11.4.7 DALI Interface Failure

If the DALI input signal is set to low level for a 2-bit

period (1.66 ms), then the DCM generates an er-

ror flag by setting the EF bit in the DCMCSR regis-

ter. This bit can be cleared by reading the DCMC-

SR register. The interface failure is detected if the

DCM is in Receive state only.

11.4.8 Low Power Modes

11.4.9 Interrupts

Mode

Description

WAIT

No effect on DCM

HALT

DCM registers are frozen

ACTIVE

HALT

No effect on DCM

Interrupt

Event

Flag

Enable

Control

Bit

Exit

from

Wait

Exit

from

Halt

EOT

ITF

ITE

Yes

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