
Overview...............................................................................................................................................4-1
Overview .......................................................................................................................................................5-1
Interrupt Types .....................................................................................................................................5-2
S3C8238/C8235 Interrupt Structure.....................................................................................................5-3
Interrupt Vector Addresses...................................................................................................................5-5
Enable/Disable Interrupt Instructions (EI, DI).......................................................................................5-7
System-Level Interrupt Control Registers.............................................................................................5-7
Interrupt Processing Control Points......................................................................................................5-8
Peripheral Interrupt Control Registers..................................................................................................5-9
System Mode Register (SYM)..............................................................................................................5-10
Interrupt Mask Register (IMR)..............................................................................................................5-11
Interrupt Priority Register (IPR) ............................................................................................................5-12
Interrupt Request Register (IRQ)..........................................................................................................5-14
Interrupt Pending Function Types ........................................................................................................5-15
Interrupt Source Polling Sequence.......................................................................................................5-16
Interrupt Service Routines....................................................................................................................5-16
Generating Interrupt Vector Addresses................................................................................................5-17
Nesting of Vectored Interrupts..............................................................................................................5-17
Overview .......................................................................................................................................................6-1
Data Types ...........................................................................................................................................6-1
Register Addressing.............................................................................................................................6-1
Addressing Modes................................................................................................................................6-1
Flags Register (FLAGS).......................................................................................................................6-6
Flag Descriptions..................................................................................................................................6-7
Instruction Set Notation ........................................................................................................................6-8
Condition Codes...................................................................................................................................6-12
Instruction Descriptions........................................................................................................................6-13