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ST7DALI Datasheet(PDF) 77 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)
DCM CONTROL REGISTER (DCMCR)
Read / Write
Reset Value: 0000 0000 (00h)
Bits 7:4 = Reserved. Forced by hardware to 0.
Bit 3 = DCME DALI Communication Enable.
This bit is set/cleared by software and cleared by
hardware after a reset.
When set, it enables DALI communication. It also
resets the entire internal finite state machine.
0: The DCM is not enable to receive/transmit
1: The DCM is enable to receive/transmit
Bit 2 = RTA Receive/Transmit Acknowledge.
This bit is reset by hardware after it has been set
by software. It is cleared after a reset.
This bit must be set, after a first DALI frame recep-
tion or transmission, to allow the DCM to perform
the next DALI communication.
0: No acknowledge
1: Acknowledge
Bit 1 = RTS Receive/Transmit state.
This bit is set/cleared by software and cleared by
hardware after a reset.
This bit must be set to ’1’ after a forward frame is
received, if a backward frame is required. This bit
must be cleared after a backward frame is trans-
mitted, if a forward frame is required.
0: The DCM is set to Receive state
1: The DCM is set to Transmit state
Bit 0 = FTS Force Transmit state.
This bit is set/cleared by software and cleared by
hardware after a reset.
When this bit is set, the DCM is forced into Trans-
mit state. Preferably before forcing the DCM into
Transmit state, the user should reset and set the
DCME bit in the DCMCR register. An interrupt flag
(ITF) is generated after a forced transmission.
0: The DCM is not forced to Transmit state
1: The DCM is forced to Transmit state
DCM CONTROL/STATUS REGISTER
(DCMCSR)
Read only (except for bit 7)
Reset Value: 0000 0000 (00h)
Bit 7 = ITE Interrupt Enable.
This bit is set/cleared by software and cleared by
hardware after a reset.
When set, this bit allows the generation of DALI in-
terrupts.
0: DCM interrupt (ITF) disabled
1: DCM interrupt (ITF) enabled
Bit 6 = ITF Interrupt Flag. (Read only)
This bit is set/cleared by hardware and read by
software.
This bit is set after the end of the "backward frame"
transmission or the "forward frame" reception. It is
cleared by setting the RTA bit in the DCMCR reg-
ister. It is set after a forced transmission (see the
FTS bit).
0: Not the end of reception/transmission
1: End of reception/transmission
Bit 5 = EF Error Flag. (Read only)
This bit is set/cleared by hardware. It is cleared by
reading the DCMCSR register.
This bit is set when either the DALI data format re-
ceived is wrong or an interface failure is detected.
0: No data format error during reception
1: Data format error during reception
Bit 4 = RTF Receive/Transmit Flag. (Read only)
This bit is set/reset by hardware and read by soft-
ware.
0: The DCM is in Transmit state
1: The DCM is in Receive state
Bits 3:0 = DCMCSR[3:0] Clock counter value.
(Read only) These bits are set/cleared by hard-
ware and read by software.
The value of the 4-bit sample clock counter (inte-
ger range 0 to 15). The clock counter value is load-
ed in the DCMCSR register when a DALI change
of phase signal is detected (edge trigger). Refer to
Figure 44.
70
0
0
0
0
DCME
RTA
RTS
FTS
70
ITE
ITF
EF
RTF
CK3
CK2
CK1
CK0
1




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