34.7.5.14 FIFO Space

This register allows the user to identify the number of bytes present in each TX and RX FIFO.
Table 34-39. Register Bit Attribute Legend
SymbolDescriptionSymbolDescriptionSymbolDescription
RReadable bitHCCleared by Hardware(Grey cell)Unimplemented
WWritable bitHSSet by HardwareXBit is unknown at Reset
KWrite to clearSSoftware settable bit——
Name: FIFOSPACE
Offset: 0x34
Reset: 0x0000

Bit 15141312111098 
    RXSPACE[4:0] 
Access RRRRR 
Reset 00000 
Bit 76543210 
    TXSPACE[4:0] 
Access RRRRR 
Reset 00000 

Bits 12:8 – RXSPACE[4:0] RX FIFO Filled Space

These bits return the number filled locations in the RX FIFO (bytes or words, depending on CTRLC.DATA32B setting).

Bits 4:0 – TXSPACE[4:0] TX FIFO Filled Space

These bits return the number of available locations in the TX FIFO (bytes or words, depending on CTRLC.DATA32B setting).

Note: When preloading is used, data written to shift register is not accessible in TXSPACE.