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Transmitter Configuration
725
SPRUI07–March 2020
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Multichannel Buffered Serial Port (McBSP)
12.9.8 Transmit Frame Phases
Table 12-54. Register Bit Used to Choose 1 or 2 Phases for the Transmit Frame
Register Bit Name Function Type
Reset
Value
XCR2 15 XPHASE Transmit phase number R/W 0
Specifies whether the transmit frame has 1 or 2 phases.
XPHASE = 0 Single-phase frame
XPHASE = 1 Dual-phase frame
12.9.9 Transmit Word Length(s)
Table 12-55. Register Bits Used to Set the Transmit Word Length(s)
Register Bit Name Function Type
Reset
Value
XCR1 7-5 XWDLEN1 Transmit word length of frame phase 1 R/W 000
XWDLEN1 = 000b 8 bits
XWDLEN1 = 001b 12 bits
XWDLEN1 = 010b 16 bits
XWDLEN1 = 011b 20 bits
XWDLEN1 = 100b 24 bits
XWDLEN1 = 101b 32 bits
XWDLEN1 = 11Xb Reserved
XCR2 7-5 XWDLEN2 Transmit word length of frame phase 2 R/W 000
XWDLEN2 = 000b 8 bits
XWDLEN2 = 001b 12 bits
XWDLEN2 = 010b 16 bits
XWDLEN2 = 011b 20 bits
XWDLEN2 = 100b 24 bits
XWDLEN2 = 101b 32 bits
XWDLEN2 = 11Xb Reserved
12.9.9.1 Word Length Bits
Each frame can have one or two phases, depending on the value that you load into the RPHASE bit. If a
single-phase frame is selected, XWDLEN1 selects the length for every serial word transmitted in the
frame. If a dual-phase frame is selected, XWDLEN1 determines the length of the serial words in phase 1
of the frame, and XWDLEN2 determines the word length in phase 2 of the frame.
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