XC2000 datasheet(111/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-49

V1.0, 2007-06

MemoryX2K, V1.1

3.9.9

Interrupt Generation

Long lasting processes (these are mainly: program page, erase page, erase sector and

margin changes) set the IMB_FSR.BUSY flag of one flash module when accepting the

request and reset this flag after finishing the process. Software is required to poll the

busy flag in order to determine the end of the operation. In order to release the software

from this burden an interrupt can be generated. If the interrupt is enabled by

IMB_INTCTRL.IEN then all transitions from 1 to 0 of one of the 3 IMB_FSR.BUSY flags

send an interrupt request.

The “Enter Page Mode” command sets BUSY only for around 100 clock cycles. It is

usually not advisable to enable the interrupt for this command.

The register IMB_INTCTR contains fields for the interrupt status “ISR”, an enable for the

interrupt request “IEN” and fields for clearing the status flag “ICLR” or setting if “ISET”. It

should be noted that the interrupt request is only sent when ISR becomes 1 and IEN was

already 1. No interrupt is sent when IEN becomes 1 when ISR was already 1 or both are

set to 1 at the same time.

XC2000 Datasheet(PDF) 111 Page - Infineon Technologies AG