CLRC663 datasheet(65/177 Pages) NXP

65 / 177 page

NXP Semiconductors

CLRC663

High performance multi-protocol NFC frontend CLRC663 and CLRC663 plus

Bit

Symbol

Description

1 to 0

FIFOLengthExtBits

Defines the bit9 (MSB) and bit8 for the FIFO length (extension of FIFOLength).

These two bits are only evaluated in the 512-byte FIFO mode. The bits 7..0 are

defined in register FIFOLength.

Table 56. FIFOControl bits...continued

9.4.2 WaterLevel

Defines the level for FIFO under- and overflow warning levels.This register is extended by 1 bit in FIFOControl

in case the 512-byte FIFO mode is activated by setting bit FIFOControl.FIFOSize.

Bit

Symbol

WaterLevelBits

Access

rights

r/w

Table 57. WaterLevel register (address 03h);

Bit

Symbol

Description

7 to 0

WaterLevelBits

Sets a level to indicate a FIFO-buffer state which can be read from bits HighAlert and

LowAlert in the FifoControl. In 512-byte FIFO mode, the register is extended by bit

WaterLevelExtBit in the FIFOControl. This functionality can be used to avoid a FIFO

buffer overflow or underflow:

The bit HiAlert bit in FIFO Control is read logic 1, if the number of bytes in the FIFO-

buffer is equal or less than the number defined by the waterlevel configuration.

The bit LoAlert bit in FIFO control is read logic 1, if the number of bytes in the FIFO

buffer is equal or less than the number defined by the waterlevel configuration.

Note: For the calculation of HiAlert and LoAlert, see register description of these bits

(see Section 9.4.1).

Table 58. WaterLevel bits

9.4.3 FIFOLength

Number of bytes in the FIFO buffer. In 512-byte mode, this register is extended by FIFOControl.FifoLength.

Bit

Symbol

FIFOLength

Access

rights

Table 59. FIFOLength register (address 04h); reset value: 00h

Bit

Symbol

Description

7 to 0

FIFOLength

Indicates the number of bytes in the FIFO buffer. In 512-byte mode this register is

extended by the bits FIFOLength in the FIFOControl register. Writing to the FIFOData

Table 60. FIFOLength bits

CLRC663

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5.3 — 3 January 2024

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