
S3C94A5/F94A5 MICROCONTROLLER
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
Clock Status During Power-Down Modes.......................................................................................7-3
System Clock Control Register (CLKCON).....................................................................................7-4
Stop Control Register (STPCON) ..................................................................................................7-5
Chapter 8
RESET 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 1.........................................................................................................................................9-3
Port 2.........................................................................................................................................9-7
Port 3.........................................................................................................................................9-9
Port 4.........................................................................................................................................9-15
Port 5.........................................................................................................................................9-19
Chapter 10
Basic Timer
Overview.............................................................................................................................................10-1
Basic Timer Control Register (BTCON)..........................................................................................10-2
Basic Timer Function Description..................................................................................................10-3