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W742C814

4-BIT MICROCONTROLLER

Winbond 

W742C814

Table of Contents-

4-BIT MICROCONTROLLER

1. GENERAL DESCRIPTION .............................................................................................................3

2. FEATURES .....................................................................................................................................3

3. PIN CONFIGURATION ...................................................................................................................4

4. PIN DESCRIPTION.........................................................................................................................5

5. BLOCK DIAGRAM ..........................................................................................................................6

6. FUNCTIONAL DESCRIPTION .......................................................................................................7

6.1 Program Counter (PC)......................................................................................................7

6.2 Stack Register (STACK) ...................................................................................................7

6.3 Program Memory (ROM) ..................................................................................................7

6.3.1 ROM Page Register (ROMPR) .................................................................................. 8

6.4 Data Memory (RAM).........................................................................................................9

6.4.1 Architecture ................................................................................................................ 9

6.4.2 Page Register (PAGE) ............................................................................................... 9

6.4.3 WR Page Register (WRP)........................................................................................ 10

6.4.4 Data Bank Register (DBKR)..................................................................................... 10

6.5 Accumulator (ACC).........................................................................................................11

6.6 Arithmetic and Logic Unit (ALU) .....................................................................................11

6.7 Oscillator .........................................................................................................................11

6.8 Dividers ...........................................................................................................................12

6.9 Dual-clock Operation ......................................................................................................12

6.10 WatchDog Timer (WDT) and WatchDog Timer Register (WDTR) .................................13

6.11 Timer/Counter .................................................................................................................15

6.11.1 Timer 0 (TM0) ........................................................................................................ 15

6.11.2 Timer 1 (TM1) ........................................................................................................ 16

6.11.3 Mode Register 0 (MR0).......................................................................................... 18

6.11.4 Mode Register 1 (MR1) & MFP Control Pin (BUZCR) ........................................... 18

6.12 Interrupts.........................................................................................................................19

6.13

Stop Mode Operation......................................................................................................20

6.13.1 Stop Mode Wake-up Enable Flag for RC Port (SEF) ............................................. 20

6.14 Hold Mode Operation......................................................................................................21

6.14.1 Hold Mode Release Enable Flag (HEF) ................................................................. 22

6.14.2 Interrupt Enable Flag (IEF)..................................................................................... 22

Publication Release Date: February 12, 2003

-1-

Revision A2

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