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Table of contents

3820 GROUP USER’S MANUAL

Table of contents

CHAPTER 1. HARDWARE

DESCRIPTION ................................................................................................................................ 1-2

FEATURES ..................................................................................................................................... 1-2

APPLICATIONS .............................................................................................................................. 1-2

PIN CONFIGURATION (TOP VIEW) ........................................................................................... 1-3

FUNCTIONAL BLOCK DIAGRAM (Package: 80P6N-A) .......................................................... 1-4

PIN DESCRIPTION ........................................................................................................................ 1-5

PART NUMBERING ....................................................................................................................... 1-7

GROUP EXPANSION .................................................................................................................... 1-8

GROUP EXPANSION (EXTENDED OPERATING TEMPERATURE VERSION) ..................... 1-9

GROUP EXPANSION (LOW POWER SOURCE VOLTAGE VERSION) ............................... 1-10

FUNCTIONAL DESCRIPTION ..................................................................................................... 1-11

Central Processing Unit (CPU) ............................................................................................... 1-11

CPU Mode Register ................................................................................................................ 1-11

MEMORY ....................................................................................................................................... 1-12

Special Function Register (SFR) Area ................................................................................... 1-12

RAM ........................................................................................................................................ 1-12

ROM ....................................................................................................................................... 1-12

Interrupt Vector Area .............................................................................................................. 1-12

Zero Page ............................................................................................................................... 1-12

Special Page ..........................................................................................................................1-12

I/O PORTS .................................................................................................................................... 1-14

Direction Registers (ports P2, P41–P47, and P5–P7) ............................................................. 1-14

Direction Registers (ports P0 and P1) .................................................................................... 1-14

Ports P3 and P40 ................................................................................................................................................. 1-14

Pull-up/Pull-down Control ....................................................................................................... 1-14

INTERRUPTS ................................................................................................................................ 1-19

Interrupt Control ...................................................................................................................... 1-19

Interrupt Operation ................................................................................................................. 1-19

Notes on Use ..........................................................................................................................1-19

Key Input Interrupt (Key-on Wake up) .................................................................................... 1-21

TIMERS ......................................................................................................................................... 1-22

Timer X ................................................................................................................................... 1-23

Timer X Write Control ............................................................................................................. 1-23

Note on CNTR0 Interrupt Active Edge Selection .................................................................... 1-23

Real Time Port Control ........................................................................................................... 1-23

Timer Y ................................................................................................................................... 1-24

Note on CNTR1 Interrupt Active Edge Selection .................................................................... 1-24

Timer 1, Timer 2, Timer 3 ....................................................................................................... 1-25

Timer 2 Write Control ............................................................................................................. 1-25

Timer 2 Output Control ........................................................................................................... 1-25

Note on Timer 1 to Timer 3 ..................................................................................................... 1-25

SERIAL I/O1 ................................................................................................................................. 1-26

Clock Synchronous Serial I/O Mode ....................................................................................... 1-26

Serial I/O1 Control Register (SIO1CON) 001A16 .................................................................................... 1-28

UART Control Register (UARTCON) 001B16 ........................................................................................... 1-28

Serial I/O1 Status Register (SIO1STS) 001916 ........................................................................................ 1-28

Transmit Buffer/Receive Buffer Register (TB/RB) 001816 ................................................................... 1-28

Baud Rate Generator (BRG) 001C16 ........................................................................................................... 1-28

SERIAL I/O2 ................................................................................................................................. 1-30

Serial I/O2 Control Register (SIO2CON) 001D16 .................................................................................... 1-30

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