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Chapter 7
Overview........................................................................................................................................................7-1
System Clock Circuit ............................................................................................................................7-1
Main Oscillator Circuits.........................................................................................................................7-2
Sub Oscillator Circuits ..........................................................................................................................7-2
Clock Status During Power-Down Modes ............................................................................................7-3
System Clock Control Register (CLKCON) ..........................................................................................7-4
Clock Output Control Register (CLOCON)...........................................................................................7-5
Oscillator Control Register (OSCCON) ................................................................................................7-6
Switching the CPU Clock......................................................................................................................7-7
Chapter 8
System Reset ................................................................................................................................................8-1
Overview...............................................................................................................................................8-1
Normal Mode Reset Operation.............................................................................................................8-1
Hardware Reset Values........................................................................................................................8-2
Power-Down Modes ......................................................................................................................................8-5
Stop Mode ............................................................................................................................................8-5
Idle Mode ..............................................................................................................................................8-6
Chapter 9
Overview........................................................................................................................................................9-1
Port Data Registers ..............................................................................................................................9-2
port 0.....................................................................................................................................................9-3
port 1.....................................................................................................................................................9-7
port 2.....................................................................................................................................................9-11
port 3.....................................................................................................................................................9-13
Port 4 ....................................................................................................................................................9-15
Port 5 ....................................................................................................................................................9-17
Port 6 ....................................................................................................................................................9-19
Chapter 10
Overview........................................................................................................................................................10-1
Basic Timer Control Register (BTCON) ...............................................................................................10-2
Basic Timer Function Description.........................................................................................................10-3
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X MICROCONTROLLER
Table of Contents
Part II Hardware Descriptions
Clock Circuit
RESET and Power-Down
I/O Ports
Basic Timer
(Continued)
vii
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