RL78/D1A User's Manual: Hardware - Renesas

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Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 6 TIMER ARRAY UNIT 6.7 Operation of Timer Array Unit as Independent Channel 6.7.1 Operation as interval timer/square wave output (1) Interval timer The timer array unit can be used as a reference timer that generates INTTMmn (timer interrupt) at fixed intervals. The interrupt generation period can be calculated by the following expression. Generation period of INTTMmn (timer interrupt) = Period of count clock (Set value of TDRmn + 1) (2) Operation as square wave output TOmn performs a toggle operation as soon as INTTMmn has been generated, and outputs a square wave with a duty factor of 50%. The period and frequency for outputting a square wave from TOmn can be calculated by the following expressions. Period of square wave output from TOmn = Period of count clock (Set value of TDRmn + 1) 2 Frequency of square wave output from TOmn = Frequency of count clock/{(Set value of TDRmn + 1) 2} TCRmn operates as a down counter in the interval timer mode. TCRmn loads the value of TDRmn at the first count clock after the channel start trigger bit (TSmn) is set to 1. If MDmn0 of TMRmn = 0 at this time, INTTMmn is not output and TOmn is not toggled. If MDmn0 of TMRmn = 1, INTTMmn is output and TOmn is toggled. After that, TCRmn counts down in synchronization with the count clock. When TCRmn = 0000H, INTTMmn is output and TOmn is toggled at the next count clock. At the same time, TCRmn loads the value of TDRmn again. After that, the same operation is repeated. TDRmn can be rewritten at any time. The new value of TDRmn becomes valid from the next period. Operation clock Figure 6-51. Block Diagram of Operation as Interval Timer/Square Wave Output CKm3 CKm2 CKm1 CKm0 TSmn Clock selection Trigger selection Remark m: Unit number (m = 0 to 2) n: Channel number (n = 0 to 7) Timer counter (TCRmn) Data register (TDRmn) Output controller Interrupt controller TOmn pin Interrupt signal (INTTMmn) R01UH0317EJ0004 Rev. 0.04 403 Feb. 22, 2013
Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 6 TIMER ARRAY UNIT Figure 6-52. Example of Basic Timing of Operation as Interval Timer/Square Wave Output (MDmn0 = 1) TSmn TEmn TCRmn TDRmn TOmn INTTMmn Remark m: Unit number (m = 0 to 2) 0000H n: Channel number (n = 0 to 7) a+1 a a+1 a+1 b+1 b+1 b+1 R01UH0317EJ0004 Rev. 0.04 404 Feb. 22, 2013 b
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User’s Manual 16 RL78/D1A 16-Bit
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NOTES FOR CMOS DEVICES (1) VOLTAGE
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Conventions Data significance: High
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CONTENTS CHAPTER 1 OUTLINE.........
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3.4.4 Short direct addressing .....
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6.8 Operation of Plural Channels of
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RL78/D1A User’s Manual: Hardware
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