MC72000 Freescale Semiconductor, MC72000 Datasheet - Page 99

• Manufacturer Part Number: MC72000
• Description: Integrated Bluetooth Radio
• Manufacturer: Freescale Semiconductor

TFCNT[3:0]—Transmit FIFO Counter
RFWM[3:0]—Receive FIFO Full WaterMark
MOTOROLA
This read-only bit field indicates the number of data words in the TXFIFO. Table 46 shows the
TFCNT[3:0] bit field encoding.
This bit field controls the threshold at which the receive FIFO full flag (RFF) will be set. RFF is set
whenever the data level in the RXFIFO reaches the selected threshold. For example, if RFWM=1, RFF
will be set after the SSI received 2 data words (one in SRX and the other in RXFIFO). Table 47 shows
RFWM[3:0] bit field encoding and Table 48 shows the status of RFF for all data levels of the RXFIFO.
0000
0001
0010
0011
0100
0101
0110
0111
1000
Bits
Reserved
RFF set when at least one data word has been written to the RXFIFO.
Set when RXFIFO = 1, 2, 3, 4, 5, 6, 7, or 8 data words
RFF set when 2 or more data words have been written to the RXFIFO.
Set when RXFIFO = 2, 3, 4, 5, 6, 7, or 8 data words
RFF set when 3 or more data words have been written to the RXFIFO.
Set when RXFIFO = 3, 4, 5, 6, 7, or 8 data words
RFF set when 4 or more data words have been written to the RXFIFO.
Set when RXFIFO = 4, 5, 6, 7, or 8 data words
RFF set when 5 or more data words have been written to the RXFIFO.
Set when RXFIFO = 5, 6, 7, or 8 data words
RFF set when 6 or more data words have been written to the RXFIFO.
Set when RXFIFO = 6, 7, or 8 data words
RFF set when 7 or more data words have been written to the RXFIFO.
Set when RXFIFO = 7 or 8 data words
RFF set when 8 data words have been written to the RXFIFO.
Set when RXFIFO = 8 data words
Freescale Semiconductor, Inc.
0110
0111
1000
0000
0001
0010
0011
0100
0101
0110
0111
1000
Table 45. RFCNT[3:0] Encoding (Continued)
Bits
Bits
For More Information On This Product,
MC72000 Advance Information Data Sheet
Table 46. TFCNT[3:0] Encoding
Table 47. RFWM[3:0] Encoding
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Preliminary
6 data words in RXFIFO
7 data words in RXFIFO
8 data words in RXFIFO
0 data words in TXFIFO
1 data words in TXFIFO
2 data words in TXFIFO
3 data words in TXFIFO
4 data words in TXFIFO
5 data words in TXFIFO
6 data words in TXFIFO
7 data words in TXFIFO
8 data words in TXFIFO
Description
Description
Description
Hardware Functional Description
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