ST92F250CV2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92F250CV2

8/16-bit single voltage Flash MCU family with RAM, E³ TM (emulated EEPROM), CAN 2.0B and J1850 BLPD

STMicroelectronics 

Device architecture

ST92F124xx/ST92F150Cxx/ST92F150JDV1/ST92F250CV2

6.8.3

DMA

Depending on the PS bit in the DAPR register (see DMA chapter), DMA uses either the ISR

or the DMASR for memory accesses: this guarantees that a DMA will always find its

memory segment(s), no matter what segment changes the application has performed.

Unlike interrupts, DMA transactions cannot save/restore paging registers, so a dedicated

segment register (DMASR) has been created. Having only one register of this kind means

that all DMA accesses should be programmed in one of the two following segments: the one

pointed to by the ISR (when the PS bit of the DAPR register is reset), and the one

referenced by the DMASR (when the PS bit is set).

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Doc ID 8848 Rev 7

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