Preliminary W742C(E)811
4-BIT MICROCONTROLLER
Table of Contents-
1. GENERAL DESCRIPTION ......................................................................................................... 4
2. FEATURES.............................................................................................................................. 4
3. PIN CONFIGURATION............................................................................................................... 6
3.1 W742C811 PAD List........................................................................................................... 7
4. PIN DESCRIPTION...................................................................................................................11
5. FUNCTIONAL DESCRIPTION....................................................................................................13
5.1 Program Counter (PC)........................................................................................................13
5.2 Stack Register (STACK).....................................................................................................13
5.3 Program Memory (ROM) ....................................................................................................14
5.3.1 ROM Page Register (ROMPR).................................................................................................................15
5.3.2 ROM Addressing Mode..............................................................................................................................15
5.4 Data Memory (RAM)..........................................................................................................17
5.4.1 Architecture ..................................................................................................................................................17
5.4.2 RAM Page Register (PAGE)......................................................................................................................18
5.4.3 WR Page Register (WRP).........................................................................................................................19
5.4.4 Data Bank Register (DBKRH, DBKRL) ..................................................................................................19
5.4.5 RAM Addressing Mode ..............................................................................................................................21
5.5 Accumulator (ACC)............................................................................................................22
5.6 Arithmetic and Logic Unit (ALU)..........................................................................................22
5.7 Main Oscillator..................................................................................................................22
5.8 Sub-Oscillator ...................................................................................................................22
5.9 Dividers.............................................................................................................................22
5.10 Dual-clock operation.........................................................................................................23
5.11 Watchdog Timer (WDT) ....................................................................................................24
5.12 Timer/Counter..................................................................................................................25
5.12.1 Timer 0 (TM0)............................................................................................................................................25
5.12.2 Timer 1 (TM1)............................................................................................................................................26
5.12.3 Mode Register 0 (MR0) ...........................................................................................................................28
5.12.4 Mode Register 1 (MR1) ...........................................................................................................................28
5.13 Interrupts.........................................................................................................................28
5.14 Stop Mode Operation .......................................................................................................29
Publication Release Date: May 1999
- 1 -
Revision A1
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