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PC87306 Datasheet(PDF) 83 Page - National Semiconductor (TI) |
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PC87306 Datasheet(HTML) 83 Page - National Semiconductor (TI) |
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83 / 110 page  100 Keyboard Controller and Real-Time Clock (Continued) TLC12379 – 53 FIGURE 10-4 Fast IRQ Latching and Clearing IRQ1 and IRQ2 When the KBC is enabled the keyboard and mouse IRQ lines (IRQ1 and IRQ12) are either identical to or a function of the 8042’s P24 and P25 as detailed in Figure 10-4 IRQ12 can be placed in TRI-STATE by setting the IRQ12 TRI-STATE control bit (bit 2 of SCF0) to 1 In this case IRQ12 input is blocked to 1 NOTE EN FLAGS command (used for routing OBF and IBF onto P24 and P25) will cause unpredictable results and should not be issued 1012 Program Memory The keyboard controller of the PC87306 has a 2kx8ROM based program memory An 11-bit program counter allows direct access to every location of the program memory Fig- ure 10-5 shows the memory map There are three special locations associated with hardware functions 1 000h After the keyboard controller is reset the program counter is initialized to 000h 2 003h When the input buffer of the host interface (DBBlN) is full and the IBF interrupt is enabled the CPU makes an interrupt call to this location 3 007h When the timer overflows and the timer interrupt is enabled the CPU makes an interrupt call to this location 1013 Data Memory and Registers The keyboard controller has 256 Bytes of data memory in- cluding 2 banks of registers 8 registers each and an 8-level stack Figure 10-5 shows the data RAM organization TLC12379 – 51 FIGURE 10-5 Keyboard Controller Data Memory Map 83 |
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