Quad-SPI interface (QUADSPI) RM0402
304/1163 RM0402 Rev 6
12.5 QUADSPI registers
12.5.1 QUADSPI control register (QUADSPI_CR)
Address offset: 0x0000
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
PRESCALER[7:0] PMM APMS Res. TOIE SMIE FTIE TCIE TEIE
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Res. Res. Res. FTHRES[4:0] FSEL DFM Res. SSHIFT TCEN DMAEN ABORT EN
rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:24 PRESCALER[7:0]: Clock prescaler
This field defines the scaler factor for generating CLK based on the AHB clock
(value+1).
0: F
CLK
= F
AHB
, AHB clock used directly as QUADSPI CLK (prescaler bypassed)
1: F
CLK
= F
AHB
/2
2: F
CLK
= F
AHB
/3
...
255: F
CLK
= F
AHB
/256
For odd clock division factors, CLK’s duty cycle is not 50%. The clock signal remains
low one cycle longer than it stays high.
This field can be modified only when BUSY = 0.
When setting QUADSPI interface in DDR mode, the prescaler must be set with a
division ratio of 2 or more.
Bit 23 PMM: Polling match mode
This bit indicates which method should be used for determining a “match” during
automatic polling mode.
0: AND match mode. SMF is set if all the unmasked bits received from the Flash
memory match the corresponding bits in the match register.
1: OR match mode. SMF is set if any one of the unmasked bits received from the Flash
memory matches its corresponding bit in the match register.
This bit can be modified only when BUSY = 0.
Bit 22 APMS: Automatic poll mode stop
This bit determines if automatic polling is stopped after a match.
0: Automatic polling mode is stopped only by abort or by disabling the QUADSPI.
1: Automatic polling mode stops as soon as there is a match.
This bit can be modified only when BUSY = 0.
Bit 21 Reserved, must be kept at reset value.
Bit 20 TOIE: TimeOut interrupt enable
This bit enables the TimeOut interrupt.
0: Interrupt disable
1: Interrupt enabled
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