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AS7341 数据表(PDF) 57 Page - OSRAM GmbH |
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AS7341 数据表(HTML) 57 Page - OSRAM GmbH |
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57 / 69 page  Document Feedback AS7341 Register Description Datasheet • PUBLIC DS000504 • v3-00 • 2020-Jun-25 68 │ 56 10.2.9 FIFO Buffer Data and Status The FIFO buffer is used to poll spectral data with fewer I²C read and write transactions. The FIFO buffer is 256 bytes of RAM containing 128 two-byte datasets. If the FIFO overflows (i.e. 129 datasets before host reads data from the FIFO buffer), an overflow flag will be set and new data will be lost. The Host acquires data by reading addresses: 0xFE – 0xFF. The register address pointer automatically wraps from 0xFF to 0xFE as data are read. Data can be read one byte at a time or in blocks, (there is no block-read length limit). When reading single bytes, the internal FIFO read pointer and the FIFO Buffer Level, FIFO_LVL, are updated each time register 0xFF is read. For block-reads, the internal FIFO read pointer and the FIFO Buffer Level, FIFO_LVL update for each two-byte entry. If the FIFO continues to be accessed after FIFO_LVL = 0, the device will return 0 for all data. The FINT interrupt indicates when there is valid data in the FIFO buffer. The amount of unread data is indicated by the FIFO_LVL. FIFO_MAP Register (Address 0xFC) Figure 87: FIFO_MAP Register Addr: 0xFC FIFO_MAP Bit Bit Name Default Access Bit Description 7 reserved 0 reserved 6 FIFO_WRITE_CH5_DATA 0 RW FIFO write CH5 Data. If set, CH5 data is written to the FIFO Buffer. (two bytes per sample) Note: If flicker detection is enabled, this bit is ignored. Refer to register 0xD7 for FDEN=”1”. 5 FIFO_WRITE_CH4_DATA 0 RW FIFO write CH4 Data. If set, CH4 data is written to the FIFO Buffer. (two bytes per sample) 4 FIFO_WRITE_CH3_DATA 0 RW FIFO write CH3 Data. If set, CH3 data is written to the FIFO Buffer. (two bytes per sample) 3 FIFO_WRITE_CH2_DATA 0 RW FIFO write CH2 Data. If set, CH2 data is written to the FIFO Buffer. (two bytes per sample) 2 FIFO_WRITE_CH1_DATA 0 RW FIFO write CH1 Data. If set, CH1 data is written to the FIFO Buffer. (two bytes per sample) 1 FIFO_WRITE_CH0_DATA 0 RW FIFO write CH0 Data. If set, CH0 data is written to the FIFO Buffer. (two bytes per sample) 0 FIFO_WRITE_ASTATUS 0 RW FIFO write Status. If set, ASTATUS (one byte per sample) is written to the FIFO Buffer. In case SP_AGC_ENABLE = 1, ASTATUS should be written to FIFO buffer. |
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