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HD6433713 Datasheet(PDF) 176 Page - Renesas Technology Corp |
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HD6433713 Datasheet(HTML) 176 Page - Renesas Technology Corp |
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176 / 324 page  3. Square wave output A 50% duty square wave can be output at pin P15/IRQ5/TMOE if this function is selected in port mode register 4 (PMR4) and bit IRQC5 in port mode register 1 (PMR1). When bit VRFR = 0 in PMR4, the square wave has a fixed frequency designated in the FREQ bit. For the frequencies that can be output, see 8.6.2 (4), Port mode register 4 (PMR4). When bit VRFR = 1, timer E overflow generates a toggle output alternating between low and high level (see figure 8-7). The overflow period is selected in timer load register E (TLE), with timer E operating in auto-reload mode (bit TME7 = 1). The operating clock can be selected by means of bits TME2 to TME0. These settings can give a waveform output of any desired frequency within the range shown in table 8-11. Figure 8-7 Square Wave Output Generated by Timer E Overflow Timer E value = H'FF TLE value (auto-reload mode selected) TMOE output waveform Timer E interrupt request 165 |
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