Data Sheet U14121EJ2V0DS00

6

CONTENTS

1. DIFFERENCES AMONG MODELS IN

2. MAJOR DIFFERENCES FROM

3. PIN CONFIGURATION (TOP VIEW).................................................................................................. 10

4. BLOCK DIAGRAM ............................................................................................................................... 13

5. PIN FUNCTIONS .................................................................................................................................. 14

5.1 Port Pins ...................................................................................................................................... 14

5.2 Non-Port Pins .............................................................................................................................. 16

5.3 Pin I/O Circuits and Recommended Connections of Unused Pins ........................................ 18

6. CPU ARCHITECTURE ......................................................................................................................... 22

6.1 Memory Space ............................................................................................................................. 22

6.2 CPU Registers.............................................................................................................................. 29

6.2.1 General-purpose registers ..............................................................................................................29

6.2.2 Control registers..............................................................................................................................30

6.2.3 Special function registers (SFRs)....................................................................................................31

7. PERIPHERAL HARDWARE FUNCTIONS.......................................................................................... 36

7.1 Ports ............................................................................................................................................. 36

7.2 Clock Generator........................................................................................................................... 37

7.3 Real-Time Output Port ................................................................................................................ 39

7.4 Timer/Event Counter ................................................................................................................... 40

7.5 A/D Converter .............................................................................................................................. 42

7.6 D/A Converter .............................................................................................................................. 43

7.7 Serial Interface............................................................................................................................. 44

7.7.1 Asynchronous serial interface/3-wire serial I/O (UART/IOE) ..........................................................45

7.7.2 Clocked serial interface (CSI) .........................................................................................................47

7.8 Clock Output Function................................................................................................................ 49

7.9 Buzzer Output Function.............................................................................................................. 49

7.10 Edge Detection Function .......................................................................................................... 50

7.11 Watch Timer ............................................................................................................................... 50

7.12 Watchdog Timer ........................................................................................................................ 51

8. INTERRUPT FUNCTIONS.................................................................................................................... 52

8.1 Interrupt Sources......................................................................................................................... 52

8.2 Vectored Interrupt ....................................................................................................................... 54

8.3 Context Switching ....................................................................................................................... 55

8.4 Macro Service .............................................................................................................................. 56

8.5 Application Example of Macro Service ..................................................................................... 57