MFRC52201HN1/TRAYB NXP [NXP Semiconductors], MFRC52201HN1/TRAYB Datasheet - Page 42

• Manufacturer Part Number: MFRC52201HN1/TRAYB
• Description: Contactless reader IC
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
MFRC522_33
Product data sheet
PUBLIC
9.3.1.10 FIFODataReg register
9.3.1.11 FIFOLevelReg register
9.3.1.12 WaterLevelReg register
Input and output of 64 byte FIFO buffer.
Table 39.
Table 40.
Indicates the number of bytes stored in the FIFO.
Table 41.
Table 42.
Defines the level for FIFO under- and overflow warning.
Table 43.
Bit
Symbol
Access
Bit
7 to 0
Bit
Symbol
Access
Bit
7
6 to 0 FIFOLevel
Bit
Symbol
Access
Symbol
FlushBuffer 1
[6:0]
FlushBuffer
Symbol
FIFOData[7:0] data input and output port for the internal 64-byte FIFO buffer
FIFODataReg register (address 09h); reset value: xxh bit allocation
FIFODataReg register bit descriptions
FIFOLevelReg register (address 0Ah); reset value: 00h bit allocation
FIFOLevelReg register bit descriptions
WaterLevelReg register (address 0Bh); reset value: 08h bit allocation
7
7
W
7
reserved
-
Value Description
-
Rev. 3 — 26 October 2009
6
6
Description
FIFO buffer acts as parallel in/parallel out converter for all serial data
stream inputs and outputs
6
immediately clears the internal FIFO buffer’s read and write pointer
and ErrorReg register’s BufferOvfl bit
reading this bit always returns 0
indicates the number of bytes stored in the FIFO buffer
writing to the FIFODataReg register increments and reading
decrements the FIFOLevel value
112133
5
5
5
FIFOData[7:0]
4
4
4
D
FIFOLevel[6:0]
WaterLevel[5:0]
3
3
R
3
R/W
2
2
2
Contactless reader IC
MFRC522
© NXP B.V. 2009. All rights reserved.
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