MAXQ61CA MAXIM [Maxim Integrated Products], MAXQ61CA Datasheet - Page 16

• Manufacturer Part Number: MAXQ61CA
• Description: 16-Bit Microcontroller with Infrared Module
• Manufacturer: MAXIM [Maxim Integrated Products]

The normal transmit mode modulates the carrier based
upon the IRDATA bit. However, the user has the option
to input the modulator (envelope) on an external pin if
desired. If the IRENV[1:0] bits are configured to 01b or
10b, the modulator/envelope is output to the IRTXM pin.
The IRDATA bit is output directly to the IRTXM pin (if
Figure 3. IR Transmission Waveform (IRCFME = 0)
16-Bit Microcontroller with Infrared Module
Figure 4. External IRTXM (Modulator) Output
16
IR Transmit—Independent External Carrier
_____________________________________________________________________________________
CARRIER OUTPUT
IR INTERRUPT
IRV INTERVAL
IR INTERRUPT
IRTXPOL = 1
IRTXPOL = 0
IRTXPOL = 1
IRTXPOL = 0
IRDATA
IRTXM
IRTXM
IRDATA
(IRV)
IRTX
IRTX
0
IRMT = 3
3
1
IRMT
1
2
and Modulator Outputs
1
0
IRMT
0
3
1
2
1
0
0
0
IRTXPOL = 0) on each IRV down-count interval bound-
ary just as if it were being used to internally modulate
the carrier frequency. If IRTXPOL = 1, the inverse of
the IRDATA bit is output to the IRTXM pin on the IRV
interval down-count boundaries. See Figure 4. When
the envelope mode is enabled, it is possible to output
either the modulated (IRENV[1:0] = 01b) or unmodulated
(INENV[1:0] = 10b) carrier to the IRTX pin.
1
0
1
IRMT
0
IRMT