DRM081, Multi-Button IR Remote Control using the MC9RS08KA2 ...

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Hardware potential on the ACMP– pin. When a KBI occurs the RC network (R11 and C3) on ACMP+ starts charging. Which button is pressed is determined by counting the time for the charge voltage on ACMP+ to equal the resistor divider voltage on ACMP–. Figure 4-1. Transmitter 9-Key Circuit There are nine buttons on the transmitter unit. The function of each button is summarized Table 4-1. Table 4-1. Buttons on the IR Remote Control Transmitter Unit Button Function S1 S2 S3 S4 S5 ACMP+ ACMP- KBI2 1 2 1 2 GND R11 4.70K C3 0.068uF VDD 1 2 4.70K 1 2 GND R10 R1 931 S1 1 2 1 2 GND C4 1uF 3 1 2 R2 1.58K S2 1 2 3 1 2 R3 2.37K S3 1 2 S1: ON/OFF S2: MODE S3: WIND S4: + S5: - 3 1 2 This is the ON/OFF button. Pressing S1 toggles the air conditioner power on and off. When the receiver is in the OFF mode, the OFF LED will be on, ON LED is off, and the LCD will be off. When the receiver is in the ON mode, the ON LED will be on, OFF LED is off, and the LCD will be on. This is the mode selection button. Pressing S2 toggles through the operating modes of the air conditioner: AUTO → COOL → HUMIDITY → WIND → HEAT and back again to AUTO (see Table 3-1). The corresponding icon on the receiver LCD is activated accordingly (see 4.3 LCD and LED Display in Receiver). This is the WIND speed selection button. Pressing S3 toggles through the wind speeds of the air conditioner: AUTO → LOW → MIDDLE → HIGH and back again to AUTO (see Table 3-1). The default setting is AUTO when the air conditioner is switched from off to on. The corresponding icon on the receiver LCD is activated accordingly (see 4.3 LCD and LED Display in Receiver). This is the “+” or increase button for temperature setting. Each S4 press increases the temperature by one Degree or Fahrenheit. This is the “–” or decrease button for temperature setting. Each S5 press decreases the temperature by one Degree or Fahrenheit. Multi-Button IR Remote Control using the MC9RS08KA2, Rev. 0 18 Freescale Semiconductor R4 3.32K S4 1 2 3 1 2 R5 4.70K S5 1 2 3 1 2 R6 6.65K S6 1 2 S6: MODEL S7: SLEEP S8: LIGHT S9: SWING 3 1 2 R7 9.31K S7 1 2 3 1 2 R8 14.0K S8 1 2 3 1 2 R9 23.7K S9 1 2 3
S6 S7 S8 S9 Table 4-1. Buttons on the IR Remote Control Transmitter Unit Button Function 4.3 LCD and LED Display in Receiver Multi-Button IR Remote Control using the MC9RS08KA2, Rev. 0 LCD and LED Display in Receiver This is the model selection button. Since there is no display on the transmitter, this key performs no function on this reference design (the model number is fixed to model #0). This is the sleep mode button. Pressing S7 activates the sleep timer and turn off the receiver LCD. The air conditioner switches off when the sleep timer expires. The actual sleep timer is not implemented on this reference design. This is the LCD backlight on/off button. Pressing S8 toggles the backlight on the receiver LCD on and off. In this reference design, this button actually toggles one of the receiver LCD icons on and off. This is the air swing selection button. Pressing S9 toggles the air conditioner louver air swing on the off. The corresponding icon on the receiver LCD is activated accordingly (see 4.3 LCD and LED Display in Receiver). Figure 4-2 shows the LED and LCD display on the MC68HC908LT8 IR remote control receiver unit. Air Conditioner OFF Air Conditioner ON Temperature Model Number Operating Modes AUTO COOL HUMIDITY WIND HEAT Air swing Light Figure 4-2. Typical Air Conditioner Receiver LCD Display Fan Wind Speed Freescale Semiconductor 19 AUTO LOW (1-bar ON) MIDDLE (3-bar ON) HIGH (5-bar ON)
Page 1: Multi-Button IR Remote Control usin
Page 4 and 5: Revision History Multi-Button IR Re
Page 6 and 7: Table of Contents Multi-Button IR R
Page 8 and 9: Introduction Timer system features
Page 10 and 11: Introduction Multi-Button IR Remote
Page 12 and 13: Fundamentals of IR Remote Control C
Page 14 and 15: System Concept (a) Front of IR RC T
Page 16 and 17: System Concept Table 3-1. Remote Co
Page 20 and 21: Hardware 4.4 IR Transmitter Diode D
Page 22 and 23: Software Design After initializatio
Page 24 and 25: Software Design Key Scan Key Deboun
Page 26 and 27: Software Design Multi-Button IR Rem
Page 28 and 29: Software Design MTIM_TCLK_FALLING e
Page 30 and 31: Software Design endm org TINY_RAMSt
Page 32 and 33: Software Design KeyScanStart: bset
Page 34 and 35: Software Design mov #(mMTIMSC_TSTP|
Page 36 and 37: Software Design cmp #%00100000 ; Ch
Page 38 and 39: Software Design sta Tx_Data_Temp ;
Page 40 and 41: Software Design End_S8: jmp Tx_Fram
Page 42 and 43: Software Design lda Tx_Data10 ldx #
Page 44: Software Design rts ; [4us] ; -----

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