
xii 
S3C94A5/F94A5 MICROCONTROLLER 
List of Figures
 (Continued)
Figure 
Number 
Title 
Page 
Number
4-1  
5-1  
5-2  
5-3  
6-1  
7-1  
7-2  
7-3  
7-4  
7-5  
7-6  
7-7  
7-8  
9-1  
9-2  
9-3  
9-4  
9-5  
9-6  
9-7  
9-8  
9-9  
9-10  
9-11  
9-12  
9-13  
9-14  
9-15  
9-16  
9-17  
9-18  
9-19  
9-20  
9-21  
9-22  
9-23  
9-24  
9-25  
9-26  
9-27  
Register Description Format .................................................................................4-4 
S3C9-Series Interrupt Type...................................................................................5-1 
Interrupt Function Diagram ...................................................................................5-2 
S3C94A5/F94A5 Interrupt Structure ......................................................................5-5 
System Flags Register (FLAGS)...........................................................................6-4 
Crystal/Ceramic Oscillator(fx)...............................................................................7-2 
External Oscillator(fx)..........................................................................................7-2 
RC Oscillator(fx)..................................................................................................7-2 
External RC Oscillator(fx).....................................................................................7-2 
Internal RC Oscillator(fx)......................................................................................7-2 
System Clock Circuit Diagram..............................................................................7-3 
System Clock Control Register (CLKCON).............................................................7-4 
STOP Control Register (STPCON) ........................................................................7-5 
S3C94A5/F94A5 I/O Port Data Register Format .....................................................9-2 
Port 1 Control Register, High Byte (P1CONH)........................................................9-4 
Port 1 Control Register, Low Byte (P1CONL) .........................................................9-4 
Port 1 Interrupt Control Register (P1INT) ................................................................9-5 
Interrupt Pending Register 1 (INTPND1).................................................................9-5 
Port 1 Interrupt Edge Selection Register, High Byte (P1EDGEH) .............................9-6 
Port 1 Interrupt Edge Selection Register, Low Byte (P1EDGEL)...............................9-6 
Port 2 Control Register, High Byte (P2CONH)........................................................9-7 
Port 2 Control Register, Low Byte (P2CONL) .........................................................9-8 
Port 2 Pull-up Control Register (P2PUR)................................................................9-8 
Port 3 Control Register, High Byte (P3CONH)........................................................9-10 
Port 3 Control Register, Low Byte (P3CONL) .........................................................9-11 
Port 3 Interrupt Control Register (P3INT) ................................................................9-12 
Interrupt Pending Register 2 (INTPND2).................................................................9-12 
Port 3 Interrupt Edge Selection Register, High Byte (P3EDGEH) .............................9-13 
Port 3 Interrupt Edge Selection Register, Low Byte (P3EDGEL)...............................9-13 
Port 3 Pull-up Control Register (P3PUR)................................................................9-14 
Port 4 Control Register, High Byte (P4CONH)........................................................9-16 
Port 4 Control Register, Middle Byte (P4CONM).....................................................9-16 
Port 4 Control Register, Low Byte (P4CONL) .........................................................9-17 
Port 4 Pull-up Control Register (P4PUR)................................................................9-17 
Port 4 and 5 Interrupt Control Register (P4n5INT)....................................................9-18 
Interrupt Pending Register 2 (INTPND2).................................................................9-18 
Port 5 Control Register, High-Byte (P5CONH)........................................................9-19 
Port 5 Control Register, Low-Byte (P5CONL) .........................................................9-20 
Port 4 and 5 Interrupt Control Register (P4n5INT)....................................................9-20 
Interrupt Pending Register 2 (INTPND2).................................................................9-21