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R8C/20 Datasheet(PDF) 452 Page - Renesas Technology Corp |
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R8C/20 Datasheet(HTML) 452 Page - Renesas Technology Corp |
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452 / 501 page  R8C/20 Group, R8C/21 Group 21. Usage Notes Rev.2.00 Aug 27, 2008 Page 436 of 458 REJ09B0250-0200 21.3.2.4 Programmable wait one-shot generation mode The following three workarounds should be performed in programmable wait one-shot generation mode. (1) To write to registers TRBPRE and TRBPR during count operation (TCSTF bit is set to 1), note the following points: • When the TRBPRE register is written continuously, allow three or more cycles of the count source for each write interval. • When the TRBPR register is written continuously, allow three or more cycles of the prescaler underflow for each write interval. (2) Do not set both the TRBPRE and TRBPR registers to 00h. (3) Set registers TRBSC and TRBPR using the following procedure. (a) To use “INT0 pin one-shot trigger enabled” as the count start condition Set the TRBSC register and then the TRBPR register. At this time, after writing to the TRBPR register, allow an interval of 0.5 or more cycles of the count source before trigger input from the INT0 pin. (b) To use “writing 1 to TOSST bit” as the start condition Set the TRBSC register, the TRBPR register, and then TOSST bit. At this time, after writing to the TRBPR register, allow an interval of 0.5 or more cycles of the count source before writing to the TOSST bit. |
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