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7477 Datasheet(PDF) 99 Page - Renesas Technology Corp |
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7477 Datasheet(HTML) 99 Page - Renesas Technology Corp |
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99 / 354 page  7470/7471/7477/7478 GROUP USER’S MANUAL 1-82 HARDWARE 1.12 Timers Fig. 1.12.10 Relation between timer value change timing and read value change timing (3) To select the CNTR pin input as Timer count source, the frequency of the CNTR count source should satisfy the condition shown in Table 1.12.14. 1.12.5 Notes on use (1) The contents of the Timer 12 mode register (T12M: Address 00F816) and the Timer 34 mode register (T34M: Address 00F916) become “0016” at reset and each timer performs a count operation. (2) Figure 1.12.10 shows the relation between Timer value change timing and read value change timing. The Timer value changes at the rise of the count source, while the read value changes at the fall of the count source. Accordingly, the read value may be larger than the real timer value by “1.” Main clock 4MHz 8MHz Upper boundary 1MHz 2MHz Lower boundary There is no special restriction. Frequency of the CNTR count source Table 1.12.14 Frequency of CNTR 0116 0016 FF16 9816 9716 0216 0116 0016 FF16 9816 9716 Timer read value Timer count source Timer value Interrupt request bit Example: Writing “9916” into Timer 1 |
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