PXD10RM Datasheet, PDF (331/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

RXCTR = receive FIFO counter
POPNXTPTR = pop next pointer
RX FIFO depth = receive FIFO depth, implementation specific
Freescale Semiconductor
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
11-49