Transmit Control 1 Register (Xcr1); Transmit Control 1 Register (Xcr1) Field Descriptions; Frame Length Formula For Transmit Control 1 Register (Xcr1) - Texas Instruments Concerto F28M36 Series Technical Reference Manual

McBSP Registers
• Specify one or two phases for each frame of transmit data (XPHASE)
• Define two parameters for phase 1 and (if necessary) phase 2: the serial word length (XWDLEN1,
XWDLEN2) and the number of words (XFRLEN1, XFRLEN2)
• Choose a transmit companding mode, if any (XCOMPAND)
• Enable or disable the transmit frame-sync ignore function (XFIG)
• Choose a transmit data delay (XDATDLY)

15.12.6.1 Transmit Control 1 Register (XCR1)

The transmit control 1 register (XCR1) is shown in
15 14
Reserved
R-0
7
XWDLEN1
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 15-78. Transmit Control 1 Register (XCR1) Field Descriptions
Bit Field Value
15 Reserved 0
14-8 XFRLEN1 0-7Fh
7-5 XWDLEN1 0-3h
0
1h
2h
3h
4h
5h
6h-7h
4-0 Reserved 0
Table 15-79. Frame Length Formula for Transmit Control 1 Register (XCR1)
XPHASE
0 0 ≤ XFRLEN1 ≤ 127
1 0 ≤ XFRLEN1 ≤ 127
1166
C28 Multichannel Buffered Serial Port (McBSP)
Figure 15-71. Transmit Control 1 Register (XCR1)
5 4
Description
Reserved bit. Read-only; returns 0 when read.
Transmit frame length 1 (1 to 128 words). Each frame of transmit data can have one or two phases,
depending on value that you load into the XPHASE bit. If a single-phase frame is selected, XFRLEN1
in XCR1 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, XFRLEN1 determines the number of serial words in phase 1 of the
frame and XFRLEN2 in XCR2 determines the number of words in phase 2 of the frame. The 7-bit
XFRLEN fields allow up to 128 words per phase. See
determine the frame length. This length corresponds to the number of words or logical time slots or
channels per frame-synchronization period.
Program the XFRLEN 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 1, load 127 into XFRLEN1.
Transmit word length 1. Each frame of transmit data can have one or two phases, depending on the
value that you load into the XPHASE bit. If a single-phase frame is selected, XWDLEN1 in XCR1
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 in XCR2
determines the word length in phase 2 of the frame.
8 bits
12 bits
16 bits
20 bits
24 bits
32 bits
Reserved (do not use)
Reserved bits. They are read-only bits and return 0s when read.
XFRLEN1 XFRLEN2
Not used
0 ≤ XFRLEN2 ≤ 127
Copyright © 2012–2019, Texas Instruments Incorporated
Figure 15-71 and described in
XFRLEN1
R/W-0
Reserved
R-0
Table 15-79
Frame Length
(XFRLEN1 + 1) words
(XFRLEN1 + 1) + (XFRLEN2 + 1) words
SPRUHE8E – October 2012 – Revised November 2019
www.ti.com
Table 15-78.
8
0
for a summary of how you
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