Freescale Semiconductor FRDM-FXS-MULTI 데이터 시트
MPL3115A2
Sensors
Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc.
23
7.2
Device ID
7.2.1
WHO_AM_I (0x0C)
Device identification register. This register contains the device identifier which is set to 0xC4 by default. The value is factory
programmed. Consult factory for custom alternate values.
7.3
FIFO Setup
7.3.1
F_STATUS (0x0D)
If the FIFO subsystem data output register driver is enabled, the status register indicates the current status information of the
FIFO subsystem.
The F_OVF and F_WMRK_FLAG flags remain asserted while the event source is still active, but the user can clear the FIFO
interrupt bit flag in the interrupt source register (INT_SOURCE) by reading the F_STATUS register. Therefore the F_OVF bit flag
will remain asserted while the FIFO has overflowed and the F_WMRK_FLAG bit flag will remain asserted while the F_CNT value
is greater than then F_WMRK value.
will remain asserted while the FIFO has overflowed and the F_WMRK_FLAG bit flag will remain asserted while the F_CNT value
is greater than then F_WMRK value.
Table 24. WHO_AM_I Register
7
6
5
4
3
2
1
0
R
WHO_AM_I
W
Reset
(NVM data)
(NVM data)
(NVM data)
(NVM data)
(NVM data)
(NVM data)
(NVM data)
(NVM data)
1
1
0
0
0
1
0
0
Table 25. F_STATUS
7
6
5
4
3
2
1
0
R
F_OVF
F_WMRK_FLAG
F_CNT5
F_CNT4
F_CNT3
F_CNT2
F_CNT1
F_CNT0
W
Reset
0
0
0
0
0
0
0
0
Table 26. FIFO Flag Event Descriptions
F_OVF
F_WMRK_FLAG
Event Description
0
—
No FIFO overflow events detected.
1
—
FIFO overflow event detected.
—
0
No FIFO watermark events detected.
—
1
FIFO watermark event detected. FIFO sample count greater than watermark value.
Table 27. FIFO Sample Count Bit Descriptions
Name
Description
F_CNT[5:0]
FIFO sample counter. F_CNT[5:0] bits indicate the number of samples currently stored in the FIFO buffer. Count
000000 indicates that the FIFO is empty.
Default value: 00_0000.
(000001 to 100000 indicates 1 to 32 samples stored in FIFO
000000 indicates that the FIFO is empty.
Default value: 00_0000.
(000001 to 100000 indicates 1 to 32 samples stored in FIFO