Datasheet

ADuC7124/ADuC7126 Data Sheet
Rev. C | Page 2 of 108
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 3
General Description......................................................................... 4
Specifications..................................................................................... 5
Timing Specifications .................................................................. 8
Absolute Maximum Ratings.......................................................... 13
ESD Caution................................................................................ 13
Pin Configurations and Function Descriptions ......................... 14
Typical Performance Characteristics ........................................... 23
Terminology .................................................................................... 26
ADC Specifications .................................................................... 26
DAC Specifications..................................................................... 26
Overview of the ARM7TDMI Core............................................. 27
Thumb Mode (T)........................................................................ 27
Long Multiply (M)...................................................................... 27
EmbeddedICE (I) ....................................................................... 27
Exceptions ................................................................................... 27
ARM Registers ............................................................................ 27
Interrupt Latency........................................................................ 28
Memory Organization ................................................................... 29
Memory Access........................................................................... 29
Flash/EE Memory....................................................................... 29
SRAM........................................................................................... 29
Memory Mapped Registers ....................................................... 29
ADC Circuit Overview .................................................................. 37
Transfer Function ....................................................................... 37
Typical Operation....................................................................... 38
MMRs Interface.......................................................................... 38
Converter Operation.................................................................. 40
Driving the Analog Inputs ........................................................ 41
Calibration................................................................................... 42
Temperature Sensor ................................................................... 42
Band Gap Reference................................................................... 43
Nonvolatile Flash/EE Memory ..................................................... 44
Programming.............................................................................. 44
Flash/EE Memory Security ....................................................... 45
Flash/EE Control Interface ....................................................... 45
Execution Time from SRAM and Flash/EE............................ 48
Reset and Remap ........................................................................ 48
Other Analog Peripherals.............................................................. 51
DAC.............................................................................................. 51
Power Supply Monitor............................................................... 53
Comparator................................................................................. 53
Oscillator and PLL—Power Control........................................ 54
Digital Peripheral ........................................................................... 58
General-Purpose Input/Output ............................................... 58
Serial Port Mux........................................................................... 60
UART Serial Interface................................................................ 60
Serial Peripheral Interface......................................................... 66
I
2
C................................................................................................. 70
PWM General Overview........................................................... 78
Programmable Logic Array (PLA) .......................................... 81
Processor Reference Peripherals................................................... 84
Interrupt System......................................................................... 84
IRQ............................................................................................... 84
Fast Interrupt Request (FIQ) .................................................... 85
Vectored Interrupt Controller (VIC)....................................... 86
Timers.......................................................................................... 91
External Memory Interfacing ................................................... 97
Hardware Design Considerations .............................................. 101
Power Supplies.......................................................................... 101
Grounding and Board Layout Recommendations............... 102
Clock Oscillator........................................................................ 102
Power-On Reset Operation..................................................... 103
Outline Dimensions ..................................................................... 104
Ordering Guide ........................................................................ 105