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S3C9228/P9228 MICROCONTROLLERS vii
Table of Contents (Continued)
Part II — Hardware Descriptions
Chapter 7 Clock Circuit
Overview................................................................................................................................................. 7-1
System Clock Circuit .......................................................................................................................7-1
CPU Clock Notation ........................................................................................................................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
Stop Control Register (STPCON) ....................................................................................................7-7
Chapter 8 RESETRESET and Power-Down
System Reset .......................................................................................................................................... 8-1
Overview.........................................................................................................................................8-1
Power-Down Modes.................................................................................................................................8-2
Stop Mode.......................................................................................................................................8-2
Idle Mode ........................................................................................................................................ 8-3
Hardware Reset Values................................................................................................................... 8-4
Chapter 9 I/O Ports
Overview................................................................................................................................................. 9-1
Port Data Registers ......................................................................................................................... 9-2
Port 0 .............................................................................................................................................. 9-3
Port 1 .............................................................................................................................................. 9-6
Port 2 .............................................................................................................................................. 9-9
Port 3 .............................................................................................................................................. 9-11
Port 4 .............................................................................................................................................. 9-14
Port 5 .............................................................................................................................................. 9-15
Port 6 .............................................................................................................................................. 9-16
Chapter 10 Basic Timer
Overview................................................................................................................................................. 10-1
Basic Timer Control Register (BTCON) ........................................................................................... 10-2
Basic Timer Function Description ....................................................................................................10-3