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ST7DALI Datasheet(PDF) 86 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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SERIAL PERIPHERAL INTERFACE (Cont’d)
11.5.6 Low Power Modes
11.5.6.1 Using the SPI to wake-up the Device
from Halt mode
In slave configuration, the SPI is able to wake-up
the Device from HALT mode through a SPIF inter-
rupt. The data received is subsequently read from
the SPIDR register when the software is running
(interrupt vector fetch). If multiple data transfers
have been performed before software clears the
SPIF bit, then the OVR bit is set by hardware.
Note: When waking up from Halt mode, if the SPI
remains in Slave mode, it is recommended to per-
form an extra communications cycle to bring the
SPI from Halt mode state to normal state. If the
SPI exits from Slave mode, it returns to normal
state immediately.
Caution: The SPI can wake-up the Device from
Halt mode only if the Slave Select signal (external
SS pin or the SSI bit in the SPICSR register) is low
when the Device enters Halt mode. So if Slave se-
lection is configured as external (see Section
11.5.3.2), make sure the master drives a low level
on the SS pin when the slave enters Halt mode.
11.5.7 Interrupts
Note: The SPI interrupt events are connected to
the same interrupt vector (see Interrupts chapter).
They generate an interrupt if the corresponding
Enable Control Bit is set and the interrupt mask in
the CC register is reset (RIM instruction).
Mode
Description
WAIT
No effect on SPI.
SPI interrupt events cause the Device to exit
from WAIT mode.
HALT
SPI registers are frozen.
In HALT mode, the SPI is inactive. SPI oper-
ation resumes when the Device is woken up
by an interrupt with “exit from HALT mode”
capability. The data received is subsequently
read from the SPIDR register when the soft-
ware is running (interrupt vector fetching). If
several data are received before the wake-
up event, then an overrun error is generated.
This error can be detected after the fetch of
the interrupt routine that woke up the Device.
Interrupt Event
Event
Flag
Enable
Control
Bit
Exit
from
Wait
Exit
from
Halt
SPI End of Trans-
fer Event
SPIF
SPIE
Yes
Yes
Master Mode
Fault Event
MODF
Yes
No
Overrun Error
OVR
Yes
No
1




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