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CDP1851DX Datasheet(PDF) 7 Page - Intersil Corporation |
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CDP1851DX Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 14 page 4-11 TABLE 4. (RA1 = 0, RA0 = 1) INTERRUPT CONTROL 76543210 Interrupt Enable/Disable INT Enable XXX A/B 0 0 1 NOTES: 1. INT Enable = 1, INT Enabled = 0, INT Disabled 2. A/B = 0, Port A = 1, Port B TABLE 5. (RA1 = 0, RA0 = 1) 76543210 Status Register D7 D6 D5 D4 D3 D2 D1 D0 NOTES: 1. All Modes (D0) B INT status (1 means set) (D1) A INT status (1 means set) 2. Bidirectional Mode Only (D2) 1 = A INT was caused by A STROBE (D3) 1 = A INT was caused by B STROBE 3. Bit-Programmable Mode (D4) A RDY input data (D5) A STROBE input data (D6) B RDY input data (D7) B STROBE input data TABLE 6. CPU CONTROLS (NOTE 1) CS RA1 RA0 RD/WE WR/RE ACTION 0 XXXX No-op bus three-stated X 0 0 X X No-op bus three-stated X X X 0 0 No-op bus three-stated X X X 1 1 No-op bus three-stated X X X 1 1 No-op bus three-stated 10110 Read status register (Note 1) 10101 Load control register 11010 Read port A (Note 1) 11001 Load port A 11110 Read port B (Note 1) 11101 Load port B NOTE: 1. Read = RD/WE = 1 and WR/RE = 0 is latched on trailing edge of CLOCK. TABLE 7. MEMORY I/O USE RD/WE INPUT WR/RE INPUT TPB INPUT } PIO Terminal I/O Space MRD TPB TPB } CPU Terminals Memory Space MWR MRD TPB CDP1851, CDP1851C |
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