ADuC7019/20/21/22/24/25/26/27/28/29
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Calibration................................................................................... 50
Temperature Sensor ................................................................... 50
Band Gap Reference................................................................... 50
Nonvolatile Flash/EE Memory ..................................................... 51
Programming.............................................................................. 51
Security ........................................................................................ 52
Flash/EE Control Interface ....................................................... 52
Execution Time from SRAM and Flash/EE............................ 54
Reset and Remap........................................................................ 54
Other Analog Peripherals.............................................................. 56
DAC.............................................................................................. 56
Power Supply Monitor............................................................... 57
Comparator................................................................................. 57
Oscillator and PLL—Power Control........................................ 58
Digital Peripherals.......................................................................... 61
3-Phase PWM............................................................................. 61
Description of the PWM Block................................................ 62
General-Purpose Input/Output................................................ 67
Serial Port Mux........................................................................... 70
UART Serial Interface................................................................ 70
Serial Peripheral Interface......................................................... 74
I2C-Compatible Interfaces......................................................... 76
Programmable Logic Array (PLA)........................................... 80
Processor Reference Peripherals................................................... 83
Interrupt System......................................................................... 83
Timers.......................................................................................... 84
External Memory Interfacing ................................................... 89
Hardware Design Considerations ................................................ 93
Power Supplies............................................................................ 93
Grounding and Board Layout Recommendations................. 94
Clock Oscillator.......................................................................... 94
Power-On Reset Operation....................................................... 95
Typical System Configuration .................................................. 95
Development Tools......................................................................... 96
PC-Based Tools........................................................................... 96
In-Circuit Serial Downloader................................................... 96
Outline Dimensions....................................................................... 97
Ordering Guide ........................................................................ 101
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
General Description ......................................................................... 4
Detailed Block Diagram .............................................................. 9
Specifications................................................................................... 10
Timing Specifications ................................................................ 13
Absolute Maximum Ratings.......................................................... 20
ESD Caution................................................................................ 20
Pin Configurations and Function Descriptions ......................... 21
ADuC7019/ADuC7020/ADuC7021/ADuC7022 .................. 21
ADuC7024/ADuC7025 ............................................................. 25
ADuC7026/ADuC7027 ............................................................. 28
ADuC7028................................................................................... 31
ADuC7029................................................................................... 33
Typical Performance Characteristics ........................................... 35
Terminology .................................................................................... 38
ADC Specifications .................................................................... 38
DAC Specifications..................................................................... 38
Overview of the ARM7TDMI Core............................................. 39
Thumb Mode (T)........................................................................ 39
Long Multiply (M)...................................................................... 39
EmbeddedICE (I) ....................................................................... 39
Exceptions ................................................................................... 39
ARM Registers ............................................................................ 39
Interrupt Latency........................................................................ 40
Memory Organization ................................................................... 41
Memory Access........................................................................... 41
Flash/EE Memory....................................................................... 41
SRAM........................................................................................... 41
Memory Mapped Registers....................................................... 41
ADC Circuit Overview .................................................................. 45
Transfer Function ....................................................................... 45
Typical Operation ....................................................................... 46
MMRs Interface.......................................................................... 46
Converter Operation.................................................................. 48
Driving the Analog Inputs ........................................................ 49
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