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XC27x5X Derivatives Peripheral Units (Vol. 2 of 2) Universal Serial Interface Channel The receive buffer register RBUF1 contains the data received from RSR1. A read action does not change the status of the receive data from “not yet read = valid” to “already read = not valid”. RBUF1 Receiver Buffer Register 1 15 14 13 12 11 (54H) 10 9 8 7 Reset Value: 0000H 6 5 4 3 2 1 0 DSR1 rh Field Bits Type Description DSR1 [15:0] rh Data of Shift Register 1 The receive buffer status register RBUF01SRH provides the status of the data in receive buffer RBUF1. RBUF01SRH Receiver Buffer 01 Status Register H (62H) 15 14 13 12 11 DS RDV RDV 1 11 10 0 rh r rh rh 10 9 8 P PAR ERR 1 1 rh rh 7 6 0 SOF 1 0 WLEN1 r rh r rh Field Bits Type Description WLEN1 [3:0] rh User’s Manual USIC, V1.0 Reset Value: 0000H 5 4 3 2 1 0 Received Data Word Length in RBUF1 This bit field indicates how many bits have been received within the last data word stored in RBUF1. This number indicates how many data bits have to be considered as receive data, whereas the other bits in RBUF1 have been cleared automatically. The received bits are always right-aligned. 0H One bit has been received. ... FH Sixteen bits have been received. 21-73 V1.2, 2008-09
