ST STM32F412 User Manual

RM0402 Rev 6 279/1163
RM0402 Flexible static memory controller (FSMC)
287
11.6.6 NOR/PSRAM controller registers
SRAM/NOR-Flash chip-select control register for bank x
(FSMC_BCRx) (x = 1 to 4)
Address offset: 8 * (x – 1), (x = 1 to 4)
Reset value: Bank 1: 0x0000 30DB
Reset value: Bank 2: 0x0000 30D2
Reset value: Bank 3: 0x0000 30D2
Reset value: Bank 4: 0x0000 30D2
This register contains the control information of each memory bank, used for SRAMs,
PSRAM and NOR Flash memories.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. WFDIS
CCLK
EN
CBURST
RW
CPSIZE[2:0]
rw rw rw rw rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ASYNC
WAIT
EXT
MOD
WAIT
EN
WREN
WAIT
CFG
Res.
WAIT
POL
BURST
EN
Res.
FACC
EN
MWID[1:0] MTYP[1:0]
MUX
EN
MBK
EN
rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:22 Reserved, must be kept at reset value.
Bit 21 WFDIS: Write FIFO disable
This bit disables the Write FIFO used by the FSMC controller.
0: Write FIFO enabled (Default after reset)
1: Write FIFO disabled
Note: The WFDIS bit of the FSMC_BCR2..4 registers is don’t care. It is only enabled through the
FSMC_BCR1 register.
Bit 20 CCLKEN: Continuous clock enable
This bit enables the FSMC_CLK clock output to external memory devices.
0: The FSMC_CLK is only generated during the synchronous memory access (read/write
transaction). The FSMC_CLK clock ratio is specified by the programmed CLKDIV value in the
FSMC_BCRx register (default after reset).
1: The FSMC_CLK is generated continuously during asynchronous and synchronous access. The
FSMC_CLK clock is activated when the CCLKEN is set.
Note: The CCLKEN bit of the FSMC_BCR2..4 registers is don’t care. It is only enabled through the
FSMC_BCR1 register. Bank 1 must be configured in Synchronous mode to generate the
FSMC_CLK continuous clock.
Note: If CCLKEN bit is set, the FSMC_CLK clock ratio is specified by CLKDIV value in the
FSMC_BTR1 register. CLKDIV in FSMC_BWTR1 is don’t care.
Note: If the Synchronous mode is used and CCLKEN bit is set, the synchronous memories
connected to other banks than Bank 1 are clocked by the same clock (the CLKDIV value in the
FSMC_BTR2..4 and FSMC_BWTR2..4 registers for other banks has no effect.)

ST STM32F412 Specifications

General

Brand	ST
Model	STM32F412
Category	Microcontrollers
Language	English