s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 221

• 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.

S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)
EXTERNAL INTERRUPT 0, 1, and 2 MODE REGISTERS (Continued)
When modifying the IMOD registers, it is possible to accidentally set an interrupt request flag. To avoid unwanted
interrupts, take these precautions when writing your programs:
1. Disable all interrupts with a DI instruction.
2. Modify the IMOD register.
3. Clear all relevant interrupt request flags.
4. Enable the interrupt by setting the appropriate IEx flag.
5. Enable all interrupts with an EI instructions.
INT0
INT1
INT2
P1.2
Figure 7-5. Circuit Diagram for INT0, INT1, and INT2 Pins
P1.1
P1.0
Edge Detection
Edge Detection
Edge Detection
IMOD0
IMOD2
2
IMOD1
IRQ0
IRQ1
IRQ2
INTERRUPTS
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