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TMPR3911 Datasheet(PDF) 232 Page - Toshiba Semiconductor

Part # TMPR3911
Description  32-Bit TX System RISC TX39 Family
PDF  462 Pages
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Manufacturer  TOSHIBA [Toshiba Semiconductor]
Direct Link  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMPR3911 Datasheet(HTML) 232 Page - Toshiba Semiconductor

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Chapter 10 IR Module
10-2
10.2 Consumer IR
10.2.1
Requirements
Consumer IR remote controllers send a burst of pulses whenever a button is pressed. The number of
bursts along with the length of each burst defines the key that has been pressed.
Burst of pulses
No pulses
Number of Bursts
Figure 10.2.1 Consumer IR Pulses
The frequency of the pulses and the pulse width is fixed for a given remote control but can vary
between different remote controls from different manufacturers. The number of pulses in a burst, the
amount of time when there are no pulses, and the number of times that the burst is repeated are used to
distinguish which key has been pressed for a given remote control.
10.2.2
Implementation
The Consumer IR Interface is designed to assist the CPU in shaping the pulses that are required to
emulate a key press on a remote control. The logic has been implemented such that the frequency
(typical consumer remote controllers use a carrier frequency in the 30 to 50 kHz range) and width of a
pulse can be programmed by the CPU for a given remote control. The processor can then vary the
number of bursts in a pulse and the amount of time when there are no pulses on a byte by byte basis in
order to emulate the various key presses.
10.2.3
Block Diagram
IR MASTER
CLOCK (IRCLK)
7-BIT
PERIOD
NUMBER
COUNTER
1-BIT
ON/OFF
REG
8-BIT
PRE
SCALE
COUNTER
IROUT
8-BIT
ON-TIME
WIDTH
COUNTER
2:1
MUX
8-BIT
HOLDING
REG
16-BIT
IR
HOLDING
REG
BAUDVAL [7:0]
PER [7:0]
ONTIME [7:0]
TXHOLD [15:0]
8-BIT
PERIOD
WIDTH
COUNTER
Figure 10.2.2 Consumer IR Block Diagram



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