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M66596FP датащи(PDF) 96 Page - Renesas Technology Corp |
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M66596FP датащи(HTML) 96 Page - Renesas Technology Corp |
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96 / 133 page ![]() M66596FP/WG rev .1.00 2006.3.14 page 94 of 127 3.9.3.2 Counter initialization in the Peripheral mode The controller initializes the interval counter under the following conditions. (1) H/W reset The IITV bit is initialized. (2) S/W reset by USBE bit The IITV bit is initialized. (3) The return from Low-power sleep state The IITV bit is initialized. (4) Buffer memory initialization by the ACLRM bit. A count is initialized although an IITV bit is not initialized. By setting an ACLRM bit to 0, the setting value of IITV is counted from the beginning. After the interval counter has been initialized, the counter is started under the following conditions, when a packet has been transferred normally. (1) An SOF is received following transmission of data in response to an IN token, in the “PID-BUF” state (2) An SOF is received after data following an OUT token is received in the “PID=BUF” state The interval counter is not initialized under the conditions noted below. (1) The pipe is disabled The “PID=NAK or STALL” setting temporarily stops the count, and the count resumes upon “PID=BUF”. (2) The USB is suspended and Bus reset The count stops temporarily and then continues when SOF packet is received. |
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