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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87306 датащи(PDF) 81 Page - National Semiconductor (TI) |
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PC87306 датащи(HTML) 81 Page - National Semiconductor (TI) |
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81 / 110 page  100 Keyboard Controller and Real-Time Clock The keyboard controller (KBC) is a general purpose 8-bit microcontroller It consists of 256 Bytes of data memory and 2 kBytes of Read-Only Memory (ROM) two 8-bit IO ports a three register system interface an 8-bit timercounter and facilities for both binary and Binary Coded Decimal (BCD) arithmetic Figure 10-1 shows the relationships of these functional blocks and Figure 10-2 displays the inter- face between the PC87306 and a host system The ROM may be custom programmed during manufacture according to customer requirements These versions of de- vices are available by special order For applications which require program development capabilities the RAM-based PC87323 SuperIO Sidewinder is recommended The KBC is enabled when bit 0 of KRR is 1 It is guaranteed to work with SYSCLK up to 16 MHz (when KRR7 e 1) The KBC is software compatible with the 8042AH industry standard keyboard controller as well as National’s PC87911 The PC87306 can execute code previously writ- ten for an 8042 without further development TLC12379 – 49 FIGURE 10-1 Keyboard Controller Functional Block Diagram 81 |
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