Set The Receive Companding Mode; Unexpected Frame-Synchronization Pulse With (R/X)Fig; Unexpected Frame-Synchronization Pulse With (R/X)Fig = 1; Register Bits Used To Set The Receive Companding Mode - Texas Instruments Concerto F28M36 Series Technical Reference Manual

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When RFIG = 0, an unexpected FSR pulse causes the McBSP to discard the contents of RSR[1,2] in
favor of the new incoming data. Therefore, if RFIG = 0 and an unexpected frame-synchronization pulse
occurs, the serial port:
1. Aborts the current data transfer
2. Sets RSYNCERR in SPCR1 to 1
3. Begins the transfer of a new data word
For more details about the frame-synchronization error condition, see
Frame-Synchronization Pulse.
15.8.10.2 Examples of Effects of RFIG
Figure 15-43 shows an example in which word B is interrupted by an unexpected frame-synchronization
pulse when (R/X)FIG = 0. In the case of reception, the reception of B is aborted (B is lost), and a new data
word (C in this example) is received after the appropriate data delay. This condition is a receive
synchronization error, which sets the RSYNCERR bit.
Figure 15-43. Unexpected Frame-Synchronization Pulse With (R/X)FIG = 0
CLK(R/X)
FS(R/X)
DR
DX
(R/X)SYNCERR
In contrast with Figure
synchronization signals are ignored (when (R/X)FIG = 1). Here, the transfer of word B is not affected by
an unexpected pulse.
Figure 15-44. Unexpected Frame-Synchronization Pulse With (R/X)FIG = 1
CLK(R/X)
FS(R/X)
D(R/X)
(R/X)SYNCERR

15.8.11 Set the Receive Companding Mode

The RCOMPAND bits (see
chosen for McBSP reception.
Table 15-30. Register Bits Used to Set the Receive Companding Mode
Register Bit Name
RCR2 4-3 RCOMPAND Receive companding mode
SPRUHE8E – October 2012 – Revised November 2019
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Frame synchronization aborts current transfer
A0 B7 B6 C7 C6
A0 B7 B6 B7 B6
15-43, Figure 15-44 shows McBSP operation when unexpected frame-
A0 B7 B6 B5 B4
Table 15-30) determine whether companding or another data transfer option is
Function
Modes other than 00b are enabled only when the appropriate RWDLEN is
000b, indicating 8-bit data.
RCOMPAND = 00 No companding, any size data, MSB received first
RCOMPAND = 01 No companding, 8-bit data, LSB received first (for details,
see
RCOMPAND = 10 μ-law companding, 8-bit data, MSB received first
RCOMPAND = 11 A-law companding, 8-bit data, MSB received first
Copyright © 2012–2019, Texas Instruments Incorporated
Section
New data received
C5 C4 C3 C2
Current data retransmitted
B5 B4 B3 B2
Frame synchronization ignored
B3 B2 B1 B0
Section 15.8.11.4).
C28 Multichannel Buffered Serial Port (McBSP)
Receiver Configuration
15.5.3, Unexpected Receive
C1 C0 D7 D6
B1 B0 C7 C6
C7 C6 C5 C4
Type
R/W
Reset
Value
00
1121