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TMP92FD54AI データシート(PDF) 41 Page - Toshiba Semiconductor |
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TMP92FD54AI データシート(HTML) 41 Page - Toshiba Semiconductor |
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41 / 84 page  2006-01-27 92FD54AI-41 TMP92FD54AI device returns the ACK response data for a Communications error (bit 3) 18H and waits for the next operation command (third byte). The four high-order bits of the returned ACK response data are the four high-order bits of the immediately preceding operation command data, so the value of these bits is always 1. Next, the device checks the checksum data in the m + 1’th byte. This check is made to see whether the low-order 8-bit value obtained by adding eight bits of the transmission data to 27 to m + 1 bytes not including the sign (ignoring overflow) is 00H. If the value is not 00H, the device returns the ACK response data for a CHECKSUM error (bit 0) 11H and waits for the next operation command (third byte). If all data is found to be normal as a result of the above check, the device returns the ACK response data for normal reception, 10H. 15. If the ACK response data in the (m + 2)th byte is a normal ACK response, the device sends the normal ACK response data 10H and then branches to the address specified by the data received as bytes 19 to 22. |
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