Short Bit Period Error (Sbpe); Long Bit Period Error (Lbpe); Figure 297. Error Handling - STMicroelectronics STM32F05 series Reference Manual

RM0091
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.
28.5.4

Short Bit Period Error (SBPE)

SBPE is set when a bit falling edge is detected earlier than expected (see
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 for the following cases:
●
Broadcast message is received containing SBPE
●
Listen mode is set (LSTN=1)
●
BRDNOGEN=1
28.5.5

Long Bit Period Error (LBPE)

LBPE is set when a bit falling edge is not detected in a valid window (see
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 297. Error handling

Legend:
BRE Checking Windows
BRE
T T T T
s 1 n1 2
Doc ID 018940 Rev 1
HDMI-CEC controller (HDMI-CEC)
CEC initiator bit-timing
BRE
SBPE
T T T T
ns 3 n0 4
Figure 297).
Figure 297). LBPE
Tolerance margins
LBPE
T T T
5 nf 6
705/742