Figure 322. Software Trigger Key Register (Stkr) - STMicroelectronics SPC572L series Reference Manual

RM0400
Field
FIFO Threshold
When the number of datawords in the data FIFO is greater than the value in FTHLD field, the
20–23
FIFO full event is flagged. An interrupt or a DMA request will be generated as determined by
FTHLD
DFFDIRE and DFFDIRS fields of RSER. For proper operation, the value in the FTHLD field
must be set to be less than or equal to the FIFO size as indicated by FSIZE.
24–27 Reserved
FIFO Over Write Enable
When set the built-in FIFO structure allows the overwritting of new converted data over older
28
converted data after the FIFO has number of entries equal to the FSIZE. In this case overrun
will not be seen.
FOWEN
0 Data FIFO OW option disabled.
1 Data FIFO OW option enabled.
FIFO Size
The maximum number of converted datawords that can be stored in the data FIFO before an
overrun occurs. This field is read-only. The reset value of this field depends on the
29–30
implementation parameter to define the FIFO size.
FSIZE
00 FIFO depth = 1 dataword
01 FIFO depth = 4 datawords
10 FIFO depth = 8 datawords
11 FIFO depth = 16 datawords
FIFO Enable
When this field is set the built-in FIFO structure is enabled. The size of the FIFO structure is
31
indicated by the FSIZE field. If this field is not set then the FIFO depth is set to one dataword
regardless of the value in the FSIZE field.
FE
0 Data FIFO is not enabled for multiple datawords; FIFO depth is one dataword
1 Data FIFO is enabled; FIFO depth is indicated by FSIZE
35.6.2.8 Software Trigger Key Register (STKR)
The Software Trigger Key Register (STKR) allows generating the trigger event output by a
software write operation.
Offset 0x001C
0 1
R 0 0
W
Reset 0 0
16 17
R
W
Reset 0 0
Sigma-Delta Analog-to-Digital Converter (SDADC) Digital Interface
Table 365. FCR field descriptions(Continued)
2 3 4 5
0 0 0 0
0 0 0 0
18 19 20 21
0 0 0 0

Figure 322. Software Trigger Key Register (STKR)

DocID027809 Rev 4
Description
6 7 8 9
0 0 0 0
0 0 0 0
22 23 24 25
ST_KEY
0 0 0 0
Access: User Read/Write
10 11 12 13
0 0 0 0
0 0 0 0
26 27 28 29
0 0 0 0
14 15
0 0
0 0
30 31
0 0
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