McBSP Registers
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SPRUI07–March 2020
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Multichannel Buffered Serial Port (McBSP)
Table 12-79. Receive Control Register 1 (RCR1) Field Descriptions (continued)
Bit Field Value Description
7-5 RWDLEN1 0-7h Receive word length 1. Each frame of receive data can have one or two phases, depending on the
value that you load into the RPHASE bit. If a single-phase frame is selected, RWDLEN1 in RCR1
selects the length for every serial word received in the frame. If a dual-phase frame is selected,
RWDLEN1 determines the length of the serial words in phase 1 of the frame, and RWDLEN2 in RCR2
determines the word length in phase 2 of the frame.
0 8 bits
1h 12 bits
2h 16 bits
3h 20 bits
4h 24 bits
5h 32 bits
6h-7h Reserved (do not use)
4-0 Reserved 0 Reserved bits (not available for your use). They are read-only bits and return 0s when read.
Table 12-80. Frame Length Formula for Receive Control 1 Register (RCR1)
RPHASE RFRLEN1 RFRLEN2 Frame Length
0 0 ≤ RFRLEN1 ≤ 127 Not used (RFRLEN1 + 1) words
1 0 ≤ RFRLEN1 ≤ 127 0 ≤ RFRLEN2 ≤ 127 (RFRLEN1 + 1) + (RFRLEN2 + 1) words
12.15.5.2 Receive Control Register 2 (RCR2)
The receive control register 2 (RCR2) is shown in Figure 12-72 and described in Table 12-81.
Figure 12-72. Receive Control Register 2 (RCR2)
15 14 8
RPHASE RFRLEN2
R/W-0 R/W-0
7 5 4 3 2 1 0
RWDLEN2 RCOMPAND RFIG RDATDLY
R/W-0 R/W-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 12-81. Receive Control Register 2 (RCR2) Field Descriptions
Bit Field Value Description
15 RPHASE Receive phase number bit. RPHASE determines whether the receive frame has one phase or two
phases. For each phase you can define the serial word length and the number of serial words in the
phase. To set up phase 1, program RWDLEN1 (word length) and RFRLEN1 (number of words). To set
up phase 2 (if there are two phases), program RWDLEN2 and RFRLEN2.
0 Single-phase frame
The receive frame has only one phase, phase 1.
1 Dual-phase frame
The receive frame has two phases, phase 1 and phase 2.
14-8 0-7Fh Receive frame length 2 (1 to 128 words). Each frame of receive data can have one or two phases,
depending on value that you load into the RPHASE bit. If a single-phase frame is selected, RFRLEN1
in RCR1 selects the number of serial words (8, 12, 16, 20, 24, or 32 bits per word) in the frame. If a
dual-phase frame is selected, RFRLEN1 determines the number of serial words in phase 1 of the
frame, and RFRLEN2 in RCR2 determines the number of words in phase 2 of the frame. The 7-bit
RFRLEN fields allow up to 128 words per phase. See Table 12-82 for a summary of how to determine
the frame length. This length corresponds to the number of words or logical time slots or channels per
frame-synchronization period.
Program the RFRLEN fields with [w minus 1], where w represents the number of words per phase. For
example, if you want a phase length of 128 words in phase 2, load 127 into RFRLEN2.
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