CLKS (CLKSP=1)
CLKS (CLKSP=0)
FSR external
(FSRP=0)
FSR external
(FSRP=1)
CLKG
(No need to resync)
FSG
CLKG
(needs resync)
mcbsp-035
CLKS (CLKSP=1)
CLKS (CLKSP=0)
FSR external
(FSRP=0)
FSR external
(FSRP=1)
CLKG
(No need to resync)
FSG
CLKG
(needs resync)
mcbsp-036
Public Version
McBSP Functional Description
www.ti.com
Each figure shows what happens to CLKG signal when the McBSPi.
[15] GSYNC
bit = 1 and if it is initially synchronized or if it is not initially synchronized.
has a slower CLKG
frequency (it has a larger divide-down value in the McBSPi.
[7:0] CLKGDV field).
Figure 21-40. CLKG Synchronization and FSG Generation (GSYNC = 1 and CLKGDV = 0x1)
Figure 21-41. CLKG Synchronization and FSG Generation (GSYNC = 1 and CLKGDV = 0x3)
21.4.4 McBSP Exception/Error Conditions
21.4.4.1 Introduction
There are several serial port events that can constitute a system error. Any error conditions can be a
source of an interrupt:
•
Receiver overrun (McBSPi.
[5] ROVFLSTAT bit is set to 1, and legacy
mode McBSPi.
[2] RFULL bit is set to 1)
This occurs when RB is full and RSR are full with another new word shifted in from mcbspi_dr.
Therefore, McBSPi.
[5] ROVFLSTAT
[2] RFULL) indicates an error condition wherein any new data that
can arrive at this time on mcbspi_dr replaces the contents of the RSR, and the previous word is lost.
The RSR continues to be overwritten as long as new data arrives on mcbspi_dr and
McBSPi.
register is not read. For more details about overrun in the receiver, see
.
3108
Multi-Channel Buffered Serial Port
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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