P R E L I M I N A R Y
CLOCK AND POWER MANAGEMENT .................................................................................... 40
Phase-Locked Loop ....................................................................................................... 40
Crystal-Driven Clock Source .......................................................................................... 40
External Source Clock ................................................................................................... 41
System Clocks ............................................................................................................... 41
Power-Save Operation ................................................................................................... 41
Initialization and Processor Reset .................................................................................. 41
Reset Configuration Register ......................................................................................... 41
CHIP-SELECT UNIT .................................................................................................................. 42
Chip-Select Timing ......................................................................................................... 42
Ready and Wait-State Programming ............................................................................. 42
Chip-Select Overlap ....................................................................................................... 42
Upper Memory Chip Select ............................................................................................ 43
Low Memory Chip Select ............................................................................................... 43
Midrange Memory Chip Selects ..................................................................................... 43
Peripheral Chip Selects ................................................................................................. 43
REFRESH CONTROL UNIT ...................................................................................................... 44
INTERRUPT CONTROL UNIT .................................................................................................. 44
TIMER CONTROL UNIT ............................................................................................................ 45
Watchdog Timer ............................................................................................................. 45
PULSE WIDTH DEMODULATION ............................................................................................ 45
DIRECT MEMORY ACCESS .................................................................................................... 46
DMA Operation .............................................................................................................. 46
DMA Channel Control Registers .................................................................................... 47
DMA Priority ................................................................................................................... 47
ASYNCHRONOUS SERIAL PORTS ......................................................................................... 47
DMA Transfers through the Serial Port .......................................................................... 48
PROGRAMMABLE I/O (PIO) PINS ........................................................................................... 48
ABSOLUTE MAXIMUM RATINGS ............................................................................................ 49
OPERATING RANGES ............................................................................................................. 49
DC CHARACTERISTICS OVER COMMERCIAL AND INDUSTRIAL OPERATING RANGES . 49
CAPACITANCE ......................................................................................................................... 50
POWER SUPPLY CURRENT ................................................................................................... 50
THERMAL CHARACTERISTICS ............................................................................................... 51
TQFP Package .............................................................................................................. 51
Typical Ambient Temperatures....................................................................................... 52
COMMERCIAL AND INDUSTRIAL SWITCHING CHARACTERISTICS AND WAVEFORMS .. 57
Key to Switching Waveforms ......................................................................................... 57
Alphabetical Key to Switching Parameter Symbols ....................................................... 58
Numerical Key to Switching Parameter Symbols ........................................................... 61
SWITCHING CHARACTERISTICS OVER COMMERCIAL AND INDUSTRIAL
OPERATING RANGES ............................................................................................... 64
Read Cycle (20 MHz and 25 MHz) ................................................................................ 64
SWITCHING CHARACTERISTICS OVER COMMERCIAL OPERATING RANGES ................. 65
Read Cycle (33 MHz and 40 MHz) ................................................................................ 65
READ CYCLE WAVEFORMS ................................................................................................... 66
SWITCHING CHARACTERISTICS OVER COMMERCIAL AND INDUSTRIAL
OPERATING RANGES ............................................................................................... 67
Write Cycle (20 MHz and 25 MHz) ................................................................................ 67
SWITCHING CHARACTERISTICS OVER COMMERCIAL OPERATING RANGES ................. 68
Write Cycle (33 MHz and 40 MHz) ................................................................................ 68
WRITE CYCLE WAVEFORMS .................................................................................................. 69
6
Am186ED/EDLV Microcontrollers
AMD [ AMD ]
