s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 214

• Manufacturer Part Number: s3c72m9
• Description: The S3c72m5/s3c72m7/s3c72m9 Single-chip Cmos Microcontroller Has Been Designed For High Performance Using Samsung S
• Manufacturer: Samsung Semiconductor, Inc.

INTERRUPTS
S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)
Vectored Interrupts
Interrupt requests may be processed as vectored interrupts in hardware, or they can be generated by program
software. A vectored interrupt is generated when the following flags and register settings, corresponding to the
specific interrupt (INTn) are set to logic one:
— Interrupt enable flag (IEx)
— Interrupt master enable flag (IME)
— Interrupt request flag (IRQx)
— Interrupt status flags (IS0, IS1)
— Interrupt priority register (IPR)
If all conditions are satisfied for the execution of a requested service routine, the start address of the interrupt is
loaded into the program counter and the program starts executing the service routine from this address.
EMB and ERB flags for RAM memory banks and registers are stored in the vector address area of the ROM during
interrupt service routines. The flags are stored at the beginning of the program with the VENT instruction. The initial
flag values determine the vectors for resets and interrupts. Enable flag values are saved during the main routine, as
well as during service routines. Any changes that are made to enable flag values during a service routine are not
stored in the vector address.
When an interrupt occurs, the enable flag values before the interrupt is initiated are saved along with the program
status word (PSW), and the enable flag values for the interrupt is fetched from the respective vector address. Then, if
necessary, you can modify the enable flags during the interrupt service routine. When the interrupt service routine is
returned to the main routine by the IRET instruction, the original values saved in the stack are restored and the main
program continues program execution with these values.
Software-Generated Interrupts
To generate an interrupt request from software, the program manipulates the appropriate IRQx flag. When the
interrupt request flag value is set, it is retained until all other conditions for the vectored interrupt have been met, and
the service routine can be initiated.
Multiple Interrupts
By manipulating the two interrupt status flags (IS0 and IS1), you can control service routine initialization and thereby
process multiple interrupts simultaneously.
If more than four interrupts are being processed at one time, you can avoid possible loss of working register data by
using the PUSH RR instruction to save register contents to the stack before the service routines are executed in the
same register bank. When the routines have executed successfully, you can restore the register contents from the
stack to working memory using the POP instruction.
Power-Down Mode Release
An interrupt can be used to release power-down mode (stop or idle). Interrupts for power-down mode release are
initiated by setting the corresponding interrupt enable flag. Even if the IME flag is cleared to zero, power-down mode
will be released by an interrupt request signal when the interrupt enable flag has been set. In such cases, the
interrupt routine will not be executed since IME = "0".
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