MAXQ613 Maxim, MAXQ613 Datasheet - Page 15

• Manufacturer Part Number: MAXQ613
• Description: The MAXQ613 is a low-power, 16-bit MAXQ® microcontroller designed for low-power applications including universal remote controls, consumer electronics, and white goods
• Manufacturer: Maxim

Figure 2. IR Transmit Carrier Generation and Carrier Modulator Control
Figure 3. IR Transmission Waveform (IRCFME = 0)
IRTX pin is set to a logic-high when the IR timer module is
enabled. If IRTXPOL = 0, the IRTX pin is set to a logic-low
when the IR timer is enabled.
A separate register bit, IR data (IRDATA), is used to
determine whether the carrier generator output is output
to the IRTX pin for the next IRMT carrier cycles. When
IRDATA = 1, the carrier waveform (or inversion of this
waveform if IRTXPOL = 1) is output on the IRTX pin dur-
ing the next IRMT cycles. When IRDATA = 0, the idle
CARRIER OUTPUT
IR INTERRUPT
IRTXPOL = 1
IRTXPOL = 0
16-Bit Microcontroller with Infrared Module
IRDATA
(IRV)
IRTX
IRTX
IRCLK
______________________________________________________________________________________
0
IRMT = 3
3
1
2
1
0
IRCAH + 1
CARRIER GENERATION
3
2
IRCAL + 1
1
0
IRDATA
IRMT
CARRIER
0
condition, as defined by IRTXPOL, is output on the IRTX
pin during the next IRMT cycles.
The IR timer acts as a down counter in transmit mode. An
IR transmission starts when the IREN bit is set to 1 when
IRMODE = 1; when the IRMODE bit is set to 1 when IREN
= 1; or when IREN and IRMODE are both set to 1 in the
same instruction. The IRMT and IRCA registers, along
with the IRDATA and IRTXPOL bits, are sampled at the
beginning of the transmit process and every time the IR
IRCFME
0
1
CARRIER MODULATION
IRV = 0000h
IRDATA ON
SAMPLE
IRTXPOL
IR INTERRUPT
0
1
IRTX PIN
15