
II CORE BLOCK: ITC (Interrupt Controller)
S1C33T01 FUNCTION PART
EPSON
B-II-5-23
Rxxx: IDMA request register
Specify whether or not to invoke IDMA when an interrupt factor occurs.
When using the set-only method (default)
Write "1": IDMA request
Write "0": Not changed
Read: Valid
When using the read/write method
Write "1": IDMA request
Write "0": Interrupt request
Read: Valid
If a bit of this register is set to "1", IDMA is invoked when the corresponding interrupt factor occurs and the
programmed data transfer is performed. If the register bit is set to "0", regular interrupt processing is performed,
without ever invoking IDMA.
For details about IDMA, refer to "IDMA (Intelligent DMA)".
If interrupts are enabled on the IDMA side and the transfer counter reaches the terminal count of 0 after completion
of DMA transfer, the IDMA request register is reset to "0" and an interrupt request for the interrupt factor that
enabled IDMA invoking is generated.
After an initial reset, this register is set to "0" (Interrupt is requested).
DExxx: IDMA enable register
Enable or disable the IDMA request.
When using the set-only method (default)
Write "1": IDMA enabled
Write "0": Not changed
Read: Valid
When using the read/write method
Write "1": IDMA enabled
Write "0": IDMA disabled
Read: Valid
If a bit of this register is set to "1", the IDMA request by the interrupt factor is enabled. If the register bit is set to
"0", the IDMA request is disabled.
After an initial reset, this register is set to "0" (IDMA is disabled).
RSTONLY: Interrupt factor flag reset method selection
(D0) / Flag set/reset method select register (0x4029F)
Select the method for resetting the interrupt factor flag.
Write "1": Reset-only method
Write "0": Read/write method
Read: Valid
With the reset-only method, the interrupt factor flag is reset by writing "1".
The interrupt factor flags for which "0" has been written can neither be set nor reset. Therefore, this method ensures
that only a specific factor flag is reset. However, when using read-modify-write instructions (e.g., bset, bclr, or bnot),
note that an interrupt factor flag that has been set to "1" is reset by writing. This method cannot be used to set any
interrupt factor flag in the software application.
The read/write method is selected by writing "0" to RSTONLY. When this method is selected, interrupt factor flags
can be read and written as for other registers. Therefore, the flag is reset by writing "0" and set by writing "1".In this
case all factor flags for which "0" has been written are reset. Even in a read-modify-write operation, an interrupt
factor can occur between read and write instructions, so be careful when using this method.
After an initial reset, RSTONLY is set to "1" (reset-only method).