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IRTX
Ideal edge
placement
IRRX
(inverter enabled)
Sampling
window
19.2.4.2.2 SIP Generation
In the MIR and FIR operation modes, the transmitter must send a serial infrared interaction pulse (SIP)
at least once every 500 ms. The SIP informs slow devices (operating in SIR mode) that the medium is
currently occupied.
When the SIPMODE bit of the mode definition register 1 (MDR1[6]) equals 1, the TX state machine
always sends one SIP at the end of a transmission frame. But when MDR1[6] = 0, the transmission of
the SIP depends on the SENDSIP bit of the auxiliary control register (ACREG[3]). The system (LH) can
set ACREG[3] at least once every 500 ms. The advantage of this approach over the default approach is
that the TX state machine does not need to send the SIP at the end of each frame which may reduce
the overhead required.
Figure 19-10
shows the SIP.
SPRUGX9 – 15 April 2011
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Preliminary
Figure 19-9. MIR Baud Rate Adjustment Mechanism
Baud adjustment cyclic pattern (3 MIR periods)
42x
42x
Figure 19-10. Serial Infrared Interaction Pulse (SIP)
8.7
1.6
s
m
Serial infrared
interaction pulse
© 2011, Texas Instruments Incorporated
41x
42x
Jitter
Jitter
41x
42x
s
m
108-012
Architecture
10x
uart-011
1693
UART/IrDA/CIR Module
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