
Table of Contents
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7751 Group User’s Manual
1.1 Performance overview .......................................................................................................... 1-3
1.3 Pin description ...................................................................................................................... 1-5
1.4 Block diagram ........................................................................................................................ 1-8
2.1 Central processing unit ....................................................................................................... 2-2
2.1.1 Accumulator (Acc) ......................................................................................................... 2-3
2.1.2 Index register X (X) ....................................................................................................... 2-3
2.1.4 Stack pointer (S) ............................................................................................................ 2-4
2.1.5 Program counter (PC) ................................................................................................... 2-5
2.2 Bus interface unit ............................................................................................................... 2-10
2.2.1 Overview ....................................................................................................................... 2-10
2.3 Access space ....................................................................................................................... 2-17
2.3.1 Banks ............................................................................................................................ 2-18
2.3.2 Direct page ................................................................................................................... 2-18
2.4 Memory assignment ........................................................................................................... 2-19
2.5 Processor modes ................................................................................................................ 2-22
2.5.1 Single-chip mode ......................................................................................................... 2-23
3.1 Programmable I/O ports ...................................................................................................... 3-2