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PC87303 Datasheet(PDF) 85 Page - National Semiconductor (TI) |
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PC87303 Datasheet(HTML) 85 Page - National Semiconductor (TI) |
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85 / 114 page  90 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 9-1 shows the relationships of these func- tional blocks and Figure 9-2 displays the interface between the PC87303 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 IO ports provide up to 18 programmable lines for dedi- cated control functions Four lines may be used to expand the number of IO ports The KBC is software compatible with the 8042AH industry standard keyboard controller as well as National’s PC87911 The PC87303 can execute code previously writ- ten for an 8042 without further development The following sections will describe in detail the operation of the functional blocks shown in Figure 9-1 The RTC supports a 100-year calendar as well as a time-of- day clock with alarm features and battery backup TLC12074 – 39 FIGURE 9-1 Keyboard Controller Functional Block Diagram 85 |
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