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ST78C36CJ44-F Datasheet(PDF) 9 Page - Exar Corporation |
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ST78C36CJ44-F Datasheet(HTML) 9 Page - Exar Corporation |
9 / 27 page ST78C36/36A 9 REV. 5.1.0 ECP/EPP PARALLEL PRINTER PORT WITH 16-BYTE FIFO Cnfg-B Bits 5-3: Select an IRQ channel per the following table: TABLE 2: IRQ SELECTION: CNFG-B BITS[5:3] WRITE TO FIFO READ FROM FIFO 000 001 7 001 001 7 (Default) 010 010 9 011 001 7 100 001 7 101 001 7 110 001 7 111 111 5 Cnfg-B Bit-6: Returns the true value of the selected IRQ pad. Cnfg-B Bit-7: Indicates RLE compression is not supported. 3.12 EXTENDED CONTROL REGISTER ( ECR ) The Extended Control Register has a system RESET state of 10010101. The significance of the bits is defined by the ECP specification as: ECR Bit-0: This read-only bit returns FIFO empty status (FIFO-E) and is forced high unless PPF, ECP, or TST mode is selected. 0 = At least one byte of data contains in the FIFO. 1 = FIFO is empty. ECR Bit-1: This read-only bit returns FIFO full status (FIFO-F) and is forced low unless PPF, ECP, or TST mode is selected. 0 = At least one empty location is available in the FIFO. 1 = FIFO is full. IRQ |
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