V DMA BLOCK: IDMA (Intelligent DMA)
B-V-3-16
EPSON
S1C33L03 FUNCTION PART
FIDMA: IDMA interrupt factor flag (D4) / DMA interrupt factor flag register (0x40281)
Indicate the occurrence status of an IDMA interrupt request.
When read
Read "1": Interrupt factor occurred
Read "0": No interrupt factor occurred
When written using reset-only method (default)
Write "1": Interrupt factor flag is reset
Write "0": Invalid
When written using the read/write method
Write "1": Interrupt factor flag is set
Write "0": Interrupt factor flag is reset
This flag is set to "1" when one DMA transfer initiated by a software trigger or subsequent link is completed and
the transfer counter is decremented to 0. However, this requires as a precondition that interrupts be enabled in
control information (DINTEN = "1").
At this time, an interrupt to the CPU is generated if the following conditions are met:
1. The corresponding interrupt enable register bit is set to "1".
2. No interrupt request of higher priority is generated.
3. The IE bit of the PSR is set to "1" (interrupt enable).
4. The corresponding interrupt priority register is set to a level higher than the CPU's interrupt level (IL).
In order for the next interrupt to be accepted after interrupt generation, the interrupt factor flag must be reset and
the PSR must be set up again (by setting the IL below the level indicated by the interrupt priority register and
setting the IE bit to "1" or executing a reti instruction).
The interrupt factor flag can only be reset by a write instruction in the software application. If the PSR is set up
again to accept interrupts (or the reti instruction is executed) without resetting the interrupt factor flag, the same
interrupt may occur again. Note also that the value to be written to reset the flag is "1" when using the reset-only
method (RSTONLY = "1") and "0" when using the read/write method (RSTONLY = "0"). Be careful not to
confuse these two cases.
This flag becomes indeterminate when initially reset, so be sure to reset it in the software application.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
Page 4: ......
Page 14: ......
Page 15: ...S1C33L03 PRODUCT PART ...
Page 16: ......
Page 147: ...S1C33L03 FUNCTION PART ...
Page 148: ......
Page 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
Page 150: ......
Page 152: ...I OUTLINE INTRODUCTION B I 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 162: ...I OUTLINE LIST OF PINS B I 3 8 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
Page 164: ......
Page 166: ...II CORE BLOCK INTRODUCTION B II 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 172: ...II CORE BLOCK CPU AND OPERATING MODE B II 2 6 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 224: ...II CORE BLOCK BCU Bus Control Unit B II 4 48 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 262: ...II CORE BLOCK DBG Debug Unit B II 7 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 263: ...S1C33L03 FUNCTION PART III PERIPHERAL BLOCK ...
Page 264: ......
Page 266: ...III PERIPHERAL BLOCK INTRODUCTION B III 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 322: ...III PERIPHERAL BLOCK WATCHDOG TIMER B III 5 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 415: ...S1C33L03 FUNCTION PART IV ANALOG BLOCK ...
Page 416: ......
Page 418: ...IV ANALOG BLOCK INTRODUCTION B IV 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 434: ...IV ANALOG BLOCK A D CONVERTER B IV 2 16 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 435: ...S1C33L03 FUNCTION PART V DMA BLOCK ...
Page 436: ......
Page 438: ...V DMA BLOCK INTRODUCTION B V 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 492: ...V DMA BLOCK IDMA Intelligent DMA B V 3 18 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 493: ...S1C33L03 FUNCTION PART VI SDRAM CONTROLLER BLOCK ...
Page 494: ......
Page 531: ...S1C33L03 FUNCTION PART VII LCD CONTROLLER BLOCK ...
Page 532: ......
Page 579: ...S1C33L03 FUNCTION PART Appendix I O MAP ...
Page 580: ......