STM32W108CB datasheet(146/278 Pages) STMICROELECTRONICS

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Serial interfaces

STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

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Doc ID 16252 Rev 14

9.12.12

Serial controller DMA status register (SCx_DMASR)

Address offset: 0xC82C (SC1_DMASR) and 0xC02C (SC2_DMASR)

Reset value:

0x0000 0000

Reserved

NSSS

FEB

FEA

PEB

PEA

OVRB

OVRA

BACK

AACK

BACK

AACK

Bits [31:13] Reserved, must be kept at reset value

Bits [12:10] NSSS:

Status of the receive count saved in SCx_DMARXCNTSAVEDR (SPI slave mode) when

nSSEL deasserts. Cleared when a receive buffer is loaded and when the receive DMA is

reset.

0: No count was saved because nSSEL did not deassert

2: Buffer A's count was saved, nSSEL deasserted once

3: Buffer B's count was saved, nSSEL deasserted once

6: Buffer A's count was saved, nSSEL deasserted more than once

7: Buffer B's count was saved, nSSEL deasserted more than once

1, 4, 5: Reserved, must be kept at reset value

Bit 9 FEB: Frame error B flag

This bit is set when DMA receive buffer B reads a byte with a frame error from the receive

FIFO. It is cleared the next time buffer B is loaded or when the receive DMA is reset.

0: No DMA buffer B frame error

1: DMA buffer B frame error

Note: Not used in SC2

Bit 8 FEA: Frame error A flag

This bit is set when DMA receive buffer A reads a byte with a frame error from the receive

FIFO. It is cleared the next time buffer A is loaded or when the receive DMA is reset.

0: No DMA buffer A frame error

1: DMA buffer A frame error

Note: Not used in SC2

Bit 7 PEB: Parity error B flag

This bit is set when DMA receive buffer B reads a byte with a parity error from the receive

FIFO. It is cleared the next time buffer B is loaded or when the receive DMA is reset.

0: No DMA buffer B parity error

1: DMA buffer B parity error

Note: Not used in SC2

Bit 6 PEA: Parity error A flag

This bit is set when DMA receive buffer A reads a byte with a parity error from the receive

FIFO. It is cleared the next time buffer A is loaded or when the receive DMA is reset.

0: No DMA buffer A parity error

1: DMA buffer A parity error

Note: Not used in SC2

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