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15.2.5 Transmit Data Buffers (TXDB0,1) ......................................................................236
15.2.6 Transmit Shift Register (TSFTR).........................................................................236
15.2.7 Receive Data Buffers (RXDB0,1)........................................................................237
15.2.8 Receive Shift Register (RSFTR) ..........................................................................237
15.3 Data Transfer.....................................................................................................................237
15.3.1 Data Transmit.......................................................................................................237
15.3.2 Data Receive ........................................................................................................238
15.4 Divider...............................................................................................................................239
15.5 External Chip Control Signal ............................................................................................240
15.6 Interrupt.............................................................................................................................241
15.7 How to Use the Special Pin (RLYCNT, RING)................................................................242
15.7.1 How to use the RLYCNT pin...............................................................................242
15.7.2 How to Use the RING pin ....................................................................................242
Section 16 Keyboard Controller Interface ........................................................ 243
16.1 Overview ...........................................................................................................................243
16.1.1 Features ................................................................................................................243
16.1.2 Block Diagram .....................................................................................................244
16.2 Register Description ..........................................................................................................245
16.2.1 Control Register (CR) ..........................................................................................245
16.2.2 Status Register (SR) .............................................................................................246
16.2.3 H8 Control 1 Register (H8C1R)...........................................................................247
16.2.4 H8 Control 2 Register (H8C2R)...........................................................................247
16.3 Function Description .........................................................................................................247
16.4 Timing Diagram ................................................................................................................247
Section 17 PS/2 Interface .................................................................................. 249
17.1 Overview ...........................................................................................................................249
17.2 Pin Configuration ..............................................................................................................249
17.3 Registers Description ........................................................................................................249
17.3.1 Keyboard Control/Status Register (KBCSR) .......................................................250
17.3.2 Keyboard Interrupt Status Register (KBISR) .......................................................251
17.3.3 Mouse Control/Status Register (MSCSR)............................................................252
17.3.4 Mouse Interrupt Status Register (MSISR)............................................................253
17.4 Block Diagram ..................................................................................................................254
17.5 Operation...........................................................................................................................255
17.5.1 Serial Data Format ...............................................................................................255
17.5.2 Software Operational Sequence ...........................................................................255
17.5.3 Communication Protocol......................................................................................256
17.6 CAUTION.........................................................................................................................258
Section 18 USB Host Controller ....................................................................... 259
18.1 Introduction .......................................................................................................................259
Rev. 3.0, 03/01, page vi of xiii
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