W921E880

W921E880A/W921C880 4-BIT MICROCONTROLLER Table of Contents- 1. GENERAL DESCRIPTION .........................................................................................................................3 2. FEATURES.................................................................................................................................................3 3. PIN CONFIGURATION ...............................................................................................................................6 4. PIN DESCRIPTION.....................................................................................................................................7 5. BLOCK DIAGRAM ......................................................................................................................................9 6. FUNCTIONAL DESCRIPTION .................................................................................................................10 6.1 ROM Memory Map .........................................................................................................................10 6.2 RAM Memory Map..........................................................................................................................11 6.2.1 Special Control Reg. Area..................................................................................................11 6.2.2 Stack Reg. Area......................................................................................................