80C186EC/80C188EC Microprocessor User's Manual

CONTENTS
CHAPTER 4
PERIPHERAL CONTROL BLOCK
4.1 PERIPHERAL CONTROL REGISTERS........................................................................ 4-1
4.2 PCB RELOCATION REGISTER.................................................................................... 4-1
4.3 RESERVED LOCATIONS ............................................................................................. 4-4
4.4 ACCESSING THE PERIPHERAL CONTROL BLOCK.................................................. 4-4
4.4.1 Bus Cycles ...............................................................................................................4-4
4.4.2 READY Signals and Wait States .............................................................................4-4
4.4.3 F-Bus Operation .......................................................................................................4-5
4.4.3.1 Writing the PCB Relocation Register ...............................................................4-6
4.4.3.2 Accessing the Peripheral Control Registers ....................................................4-6
4.4.3.3 Accessing Reserved Locations .......................................................................4-6
4.5 SETTING THE PCB BASE LOCATION......................................................................... 4-6
4.5.1 Considerations for the 80C187 Math Coprocessor Interface ....................................4-7
CHAPTER 5
CLOCK GENERATION AND POWER MANAGEMENT
5.1 CLOCK GENERATION.................................................................................................. 5-1
5.1.1 Crystal Oscillator .......................................................................................................5-1
5.1.1.1 Oscillator Operation .........................................................................................5-2
5.1.1.2 Selecting Crystals ............................................................................................5-5
5.1.2 Using an External Oscillator ......................................................................................5-6
5.1.3 Output from the Clock Generator ..............................................................................5-6
5.1.4 Reset and Clock Synchronization .............................................................................5-6
5.2 POWER MANAGEMENT............................................................................................. 5-10
5.2.1 Idle Mode ................................................................................................................5-11
5.2.1.1 Entering Idle Mode ........................................................................................5-11
5.2.1.2 Bus Operation During Idle Mode ...................................................................5-13
5.2.1.3 Leaving Idle Mode .........................................................................................5-14
5.2.1.4 Example Idle Mode Initialization Code ..........................................................5-15
5.2.2 Powerdown Mode ...................................................................................................5-16
5.2.2.1 Entering Powerdown Mode ...........................................................................5-17
5.2.2.2 Leaving Powerdown Mode ............................................................................5-18
5.2.3 Power-Save Mode ..................................................................................................5-19
5.2.3.1 Entering Power-Save Mode ..........................................................................5-20
5.2.3.2 Leaving Power-Save Mode ...........................................................................5-22
5.2.3.3 Example Power-Save Initialization Code .......................................................5-22
5.2.4 Implementing a Power Management Scheme ........................................................5-24
CHAPTER 6
CHIP-SELECT UNIT
6.1 COMMON METHODS FOR GENERATING CHIP-SELECTS....................................... 6-1
6.2 CHIP-SELECT UNIT FEATURES AND BENEFITS ...................................................... 6-1
6.3 CHIP-SELECT UNIT FUNCTIONAL OVERVIEW ......................................................... 6-2
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