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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC97338VLJ датащи(PDF) 191 Page - National Semiconductor (TI) |
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PC97338VLJ датащи(HTML) 191 Page - National Semiconductor (TI) |
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191 / 221 page  191 www.national.com 6.2 INTERRUPT SUPPORT 6.2.1 Legacy Mode Tables 100 and 101 describe the possible interrupt source for each IRQ, in legacy mode. A plus sign ( +) means this is a possible interrupt source and a minus sign ( −) means it is not. Table 101 also indicates the conditions that must be true to enable IRQ 5, 12 and 15. All conditions in the row (horizontally) must be true to enable the interrupt. An x indicates the value does not matter. It is illegal to configure two or more devices to the same ISA interrupt, with the exception of SCC1 and SCC2 which can be configured to the same ISA inter- rupt. An ISA interrupt may be configured to a specific device only when the device is disabled. Table 102 describes the conditions under which each interrupt is put in TRI-STATE, in Legacy mode. For each interrupt to be put in TRI-STATE, every col- umn must have one true condition. If no condition is true in any one column, the signal will not be put in TRI-STATE. TABLE 100. Interrupt Support in Legacy Mode for IRQ3, 4, 6, 7, 9 10 and 11 TABLE 101. Interrupt Support in Legacy Mode for IRQ 5, 12 and 15 Interrupt Possible Interrupt Source SCC1 SCC2 Parallel Port FDC SIRQIn a a. n = 1, 2 or 3 IRQ3,4 + +−−+ IRQ6 − −−++ IRQ7 − −+−+ IRQxb b. x = 9, 10 or 11 − −−−+ Interrupt Conditions Possible Interrupt Source Bit 0 of ASC Bit 3 of SCF3 Bits 7,6 of SIRQI1 Reset Value of CFG0 SCC1 SCC2 Parallel Port FDC SIRQI1 SIRQI2 SIRQI3 IRQ5 0x x x −−+−++ + 1x x x −−−−−− − IRQ12 x0 x 0 −−−−++ + x1 x 0 −−−−−− − xx x 1 −−−−−− − IRQ15 xx 0 0 x −−−−−+ + xx 0 1 x −−−−−− − xx 1 x x −−−−−− − |
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