ADuC7124/ADuC7126
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Band Gap Reference................................................................... 45
Nonvolatile Flash/EE Memory ..................................................... 46
Programming.............................................................................. 46
Flash/EE Memory Security ....................................................... 47
Flash/EE Control Interface ....................................................... 47
Execution Time from SRAM and Flash/EE............................ 50
Reset and Remap........................................................................ 50
Other Analog Peripherals.............................................................. 53
DAC.............................................................................................. 53
Power Supply Monitor............................................................... 55
Comparator................................................................................. 55
Oscillator and PLL—Power Control........................................ 56
Digital Peripheral ........................................................................... 60
General-Purpose Input/Output................................................ 60
Serial Port Mux........................................................................... 62
UART Serial Interface................................................................ 62
Serial Peripheral Interface......................................................... 68
I2C................................................................................................. 72
PWM General Overview........................................................... 80
Programmable Logic Array (PLA)........................................... 83
Processor Reference Peripherals................................................... 86
Interrupt System......................................................................... 86
IRQ ............................................................................................... 86
Fast Interrupt Request (FIQ) .................................................... 87
Vectored Interrupt Controller (VIC)....................................... 88
Timers.......................................................................................... 93
External Memory Interfacing ................................................... 99
Hardware Design Considerations .............................................. 103
Power Supplies.......................................................................... 103
Grounding and Board Layout Recommendations............... 104
Clock Oscillator........................................................................ 104
Power-On Reset Operation..................................................... 105
Outline Dimensions..................................................................... 106
Ordering Guide ........................................................................ 107
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
General Description......................................................................... 5
Specifications..................................................................................... 6
Timing Specifications .................................................................. 9
Absolute Maximum Ratings.......................................................... 14
ESD Caution................................................................................ 14
Pin Configurations and Function Descriptions ......................... 15
Typical Performance Characteristics ........................................... 24
Terminology .................................................................................... 27
ADC Specifications .................................................................... 27
DAC Specifications..................................................................... 27
Overview of the ARM7TDMI Core............................................. 28
Thumb Mode (T)........................................................................ 28
Long Multiply (M)...................................................................... 28
EmbeddedICE (I) ....................................................................... 28
Exceptions ................................................................................... 28
ARM Registers ............................................................................ 28
Interrupt Latency........................................................................ 29
Memory Organization ................................................................... 30
Memory Access........................................................................... 30
Flash/EE Memory....................................................................... 30
SRAM........................................................................................... 30
Memory Mapped Registers....................................................... 30
ADC Circuit Overview .................................................................. 38
Transfer Function ....................................................................... 38
Typical Operation ....................................................................... 39
MMRs Interface.......................................................................... 39
Converter Operation.................................................................. 41
Driving the Analog Inputs ........................................................ 43
Calibration................................................................................... 44
Temperature Sensor ................................................................... 44
Rev. D | Page 2 of 110
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