RM0444 Rev 5 1353/1390
RM0444 HDMI-CEC controller (CEC)
1364
In the case of a BRE detection, the message reception can be stopped according to the
BRESTP bit value and an error bit can be generated if BREGEN bit is set.
When BRE is detected in a broadcast message with BRESTP = 1 an error bit is generated
even if BREGEN = 0 to enforce initiator’s retry of the failed transmission. Error bit
generation can be disabled by configuring BREGEN = 0, BRDNOGEN = 1.
39.5.4 Short bit period error (SBPE)
SBPE is set when a bit falling edge is detected earlier than expected (see Figure 422).
SBPE flag also generates a CEC interrupt if the SBPEIE = 1.
An error bit is always generated on the line in case of a SBPE error detection. An error bit is
not generated upon SBPE detection only when Listen mode is set (LSTN = 1) and the
following conditions are met:
• A directly addressed message is received containing SBPE
• A broadcast message is received containing SBPE AND BRDNOGEN = 1
39.5.5 Long bit period error (LBPE)
LBPE is set when a bit falling edge is not detected in a valid window (see Figure 422). LBPE
flag also generates a CEC interrupt if the LBPEIE = 1.
LBPE always stops the reception, an error bit is generated on the line when LBPEGEN bit is
set.
When LBPE is detected in a broadcast message an error bit is generated even if
LBPEGEN = 0 to enforce initiator’s retry of the failed transmission. Error bit generation can
be disabled by configuring LBPEGEN = 0, BRDNOGEN = 1.
Note: The BREGEN = 1, BRESTP = 0 configuration must be avoided.
Figure 422. Error handling
T
s
T
1
T
n1
T
2
T
3
T
n0
T
4
T
5
T
nf
T
6
T
ns
BRE
BRE Checking Window Tolerance margins
Legend:
BRE
SBPE
LBPE
MS31011V1
CEC initiator bit-timing
To Next Page
Loading...
Need help?
General
