3874 Group User’s Manual
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Table of contents
DESCRIPTION ................................................................................................................................ 1-2
FEATURES ...................................................................................................................................... 1-2
APPLICATION ................................................................................................................................ 1-2
PIN CONFIGURATION .................................................................................................................. 1-3
FUNCTIONAL BLOCK .................................................................................................................. 1-5
PIN DESCRIPTION ........................................................................................................................ 1-6
PART NUMBERING ....................................................................................................................... 1-8
GROUP EXPANSION .................................................................................................................. 1-10
FUNCTIONAL DESCRIPTION .................................................................................................... 1-12
ROM PROGRAMMING METHOD .............................................................................................. 1-71
2.1 I/O port ..................................................................................................................................... 2-2
2.1.1 Memory assignment ....................................................................................................... 2-2
2.1.2 Relevant registers .......................................................................................................... 2-3
2.1.3 Notes on use .................................................................................................................. 2-6
2.2 Interrupts ................................................................................................................................. 2-9
2.2.1 Memory assignment ....................................................................................................... 2-9
2.2.2 Relevant registers ........................................................................................................ 2-10
2.2.4 Key input interrupt ....................................................................................................... 2-22
2.2.6 Notes on use ................................................................................................................ 2-24
2.3.8 Notes on use ................................................................................................................ 2-49