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PC87364-XXX/VLA Datasheet(PDF) 151 Page - National Semiconductor (TI) |
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PC87364-XXX/VLA Datasheet(HTML) 151 Page - National Semiconductor (TI) |
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151 / 180 page  149 www.national.com 9.0 Legacy Functional Blocks This chapter briefly describes the following blocks that provide legacy device functions: q Keyboard and Mouse Controller (KBC) q Floppy Disk Controller (FDC) q Parallel Port q Serial Port 1 (SP1), UART Functionality for both Serial Port 1 and Serial Port 2 q Serial Port 2 (SP2), Infrared Functionality The description of each Legacy block includes the sections listed below. For more information about legacy blocks, contact your National representative. q General Description q Register Map table(s) q Bitmap table(s). The register maps in this chapter use the following abbreviations for Type: q R/W = Read/Write q R = Read from a specific address returns the value of a specific register. Write to the same address is to a different register. q W=Write q RO = Read Only q R/W1C = Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect. 9.1 KEYBOARD AND MOUSE CONTROLLER (KBC) 9.1.1 General Description The KBC is implemented physically as a single hardware module and houses two separate logical devices: a Mouse con- troller and a Keyboard controller. The KBC is functionally equivalent to the industry standard 8042A Keyboard controller, which may serve as a detailed tech- nical reference for the KBC. 9.1.2 KBC Register Map 9.1.3 KBC Bitmap Summary Offset Mnemonic Register Name Type 00h DBBOUT Read KBC Data R DBBIN Write KBC Data W 04h STATUS Read Status R DBBIN Write KBC Command W Register Bits Offset Mnemonic 76543210 00h DBBOUT KBC Data Bits (For Read cycles) DBBIN KBC Data Bits (For Write cycles) 04h STATUS General Purpose Flags F1 F0 IBF OBF DBBIN KBC Command Bits (For Write cycles) |
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