STR720 Datasheet, PDF (199/401 Pages) STMicroelectronics – ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

STR720 - BUFFERED SPI (BSPI)
RBURST_
LEN[1:0]
00
01
10
11
BURST LENGTH
1 word transferred
4 words transferred
8 words transferred
16 words transferred
Note The value set in RBURST_LEN field should match with the configured burst length
set in the corresponding DMA channel (SoBurst field in DMA control register).
Bits 3:2 = TBURST_LEN [1:0]: Transmit BURST LENgth
These bits configure the burst length when the BSPI transmits data. This programmable
length is used to set the number of data words the DMA controller is expected to send upon a
transmit request; this value is used in the DMA interface to determine when the BSPI is ready
to receive a data burst from the DMA. A word can be 16 bit or 8 bit wide according to the
configuration set in WL bits inside BSPCSR1 register.
TBURST_
LEN[1:0]
00
01
10
11
BURST LENGTH
1 word transferred
4 words transferred
8 words transferred
16 words transferred
Note The value set in TBURST_LEN field should match with the configured burst length
set in the corresponding DMA channel (SoBurst field in DMA control register).
Bit 1 = DMA_EN: DMA interface ENable
This bit is a general enable switch for the DMA interface. When BSPI DMA interface is
disabled no request line will be activated and data transfer can occur through interrupt
notification only.
0 = DMA interface is disabled.
1 = DMA interface is enabled.
Bit 0 = MASK_SS: MASK Slave Select
This bit can be used to mask the status of Slave Select pin when BSPI is in master mode and
the pad corresponding to SS pin is not available. When this bit is set to ‘1’, the Bus Error
interrupt condition cannot be detected since internally the related signal is always considered
high regardless from the actual pad status.
0 = Slave Select pin is used.
1 = Slave Select pin is masked.
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