ADuC7122BBCZ datasheet(2/96 Pages) AD

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ADuC7122

Data Sheet

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 3

General Description ......................................................................... 4

Specifications..................................................................................... 5

Timing Specifications .................................................................. 9

Absolute Maximum Ratings.......................................................... 14

ESD Caution................................................................................ 14

Pin Configuration and Function Descriptions........................... 15

Terminology .................................................................................... 19

ADC Specifications .................................................................... 19

DAC Specifications..................................................................... 19

Overview of the ARM7TDMI Core............................................. 20

Thumb Mode (T)........................................................................ 20

Long Multiply (M)...................................................................... 20

EmbeddedICE (I) ....................................................................... 20

Exceptions ................................................................................... 20

ARM Registers ............................................................................ 20

Interrupt Latency........................................................................ 21

Memory Organization ................................................................... 22

Flash/EE Memory....................................................................... 22

SRAM........................................................................................... 22

Memory Mapped Registers....................................................... 22

Complete MMR Listing............................................................. 23

ADC Circuit Overview .................................................................. 27

ADC Transfer Function............................................................. 28

Typical Operation....................................................................... 29

Temperature Sensor ................................................................... 30

Converter Operation.................................................................. 33

Driving the Analog Inputs ........................................................ 34

Band Gap Reference................................................................... 34

Power Supply Monitor ............................................................... 35

Nonvolatile Flash/EE Memory ..................................................... 36

Flash/EE Memory Overview..................................................... 36

Flash/EE Memory....................................................................... 36

Flash/EE Memory Security ....................................................... 37

Flash/EE Control Interface........................................................ 37

Execution Time from SRAM and FLASH/EE........................ 40

Reset and Remap ........................................................................ 41

Other Analog Peripherals.............................................................. 43

DAC.............................................................................................. 43

LDO (Low dropout Regulator)................................................. 45

Oscillator and PLL—Power Control............................................ 46

External Crystal Selection......................................................... 46

External Clock Selection ........................................................... 46

Power Control System ............................................................... 47

MMRs and Keys ......................................................................... 48

Digital Peripherals.......................................................................... 49

PWM General Overview........................................................... 49

PWM Convert Start Control .................................................... 51

General-Purpose I/O ..................................................................... 52

UART Serial Interface.................................................................... 54

Baud Rate Generation................................................................ 54

UART Register Definition......................................................... 54

I2C..................................................................................................... 59

Serial Clock Generation ............................................................ 59

I2C Bus Addresses....................................................................... 59

I2C Registers................................................................................ 60

I2C Common Registers.............................................................. 68

Serial Peripheral Interface ............................................................. 69

SPIMISO (Master In, Slave Out) Pin....................................... 69

SPIMOSI (Master Out, Slave In) Pin....................................... 69

SPICLK (Serial Clock I/O) Pin................................................. 69

SPI Chip Select (SPICS Input) Pin........................................... 69

Configuring External Pins for SPI Functionality................... 69

SPI Registers................................................................................ 70

Programmable Logic Array (PLA)............................................... 73

Interrupt System ............................................................................. 76

IRQ ............................................................................................... 77

Fast Interrupt Request (FIQ) .................................................... 77

Timers.......................................................................................... 83

Hour:Minute:Second:1/128 Format......................................... 83

Timer0—Lifetime Timer........................................................... 84

Timer1—General-Purpose Timer ........................................... 85

Timer2—Wake-Up Timer......................................................... 87

Timer3—Watchdog Timer........................................................ 89

Timer4—General-Purpose Timer ........................................... 91

Hardware Design Considerations ................................................ 93

Power Supplies............................................................................ 93

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