S3F8285 datasheet(8/369 Pages) SAMSUNG

8 / 369 page

S3C828B/F828B/C8289/F8289/C8285/F8285 MICROCONTROLLER

vii

Table of Contents (Continued)

Part II Hardware Descriptions

Chapter 7

Clock Circuit

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

Oscillator Control Register (OSCCON) ................................................................................................7-5

Switching the CPU Clock......................................................................................................................7-6

Chapter 8

RESET and Power-Down

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

I/O Ports

Overview........................................................................................................................................................9-1

Port Data Registers ..............................................................................................................................9-2

Port 0 ....................................................................................................................................................9-3

Port 1 ....................................................................................................................................................9-7

Port 2 ....................................................................................................................................................9-9

Port 3 ....................................................................................................................................................9-11

Port 4 ....................................................................................................................................................9-13

Port 5 ....................................................................................................................................................9-15

Port 6 ....................................................................................................................................................9-17

Port 7 ....................................................................................................................................................9-19

Port 8 ....................................................................................................................................................9-20

Chapter 10

Basic Timer

Overview........................................................................................................................................................10-1

Basic Timer (BT)...................................................................................................................................10-1

Basic Timer Control Register (BTCON) ...............................................................................................10-1

Basic Timer Function Description.........................................................................................................10-3

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