Transmission Error Detection (Txerr); Table 243. Error Handling Timing Parameters - ST STM32G0 1 Series Reference Manual

HDMI-CEC controller (CEC)
Time
T
s
T
1
T
n1
T
2
T
ns
T
3
T
n0
T
4
T
5
T
nf
T
6
39.5.6

Transmission error detection (TXERR)

The CEC initiator sets the TXERR flag if detecting low impedance on the CEC line when it is
transmitting high impedance and is not expecting a follower asserted bit. TXERR flag also
generates a CEC interrupt if the TXERRIE = 1.
TXERR assertion stops the message transmission. Application is in charge to retry the
failed transmission up to five times.
TXERR checks are performed differently depending on the different states of the CEC line
and on the RX tolerance configuration.
1354/1390

Table 243. Error handling timing parameters

RXTOL ms
x 0
1 0.3
0 0.4
x 0.6
0 0.8
1 0.9
x 1.05
1 1.2
0 1.3
x 1.5
0 1.7
1 1.8
1 1.85
0 2.05
x 2.4
0 2.75
1 2.95
RM0444 Rev 5
Description
Bit start event.
The earliest time for a low - high transition when
indicating a logical 1.
The nominal time for a low - high transition when
indicating a logical 1.
The latest time for a low - high transition when
indicating a logical 1.
Nominal sampling time.
The earliest time a device is permitted return to a high
impedance state (logical 0).
The nominal time a device is permitted return to a
high impedance state (logical 0).
The latest time a device is permitted return to a high
impedance state (logical 0).
The earliest time for the start of a following bit.
The nominal data bit period.
The latest time for the start of a following bit.
RM0444