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Field
Name
R/W
Description
Note: When accessing asynchronous NOR flash memory, SRAM
or ROM, this parameter is invalid. When operating CRAM, this
parameter is 0.
29:28 ASYNCACCCFG R/W
Asynchronous Access Mode Configure
Valid only when EXTMODEEN bit of SMC_CSCTRLX register is 1.
00: Access mode A
01: Access mode B
10: Access mode C
11: Access mode D
31:30
Reserved
SRAM/NOR flash memory write timing register 1…4 (SMC_WRTTIM1…4)
Offset address: 0x104 + 8*(x-1), x=1…4
Reset value: 0x0FFF FFFF
Field
Name
R/W
Description
3:0
ADDRSETCFG
R/W
Address Setup Time Configure
Only apply to NOR flash memory operation in SRAM, ROM and
asynchronous bus multiplexing mode.
0000: 1 HCLK clock cycle
0001: 2 HCLK clock cycles
……
1111: 16 HCLK clock cycles
Note: In synchronous operation, this parameter is meaningless and
is always 1 memory clock cycle
7:4
ADDRHLDCFG
R/W
Address-Hold Time Configure
Only apply to NOR flash memory operation in SRAM, ROM and
asynchronous bus multiplexing mode.
0000: Reserved
0001: 2 HCLK clock cycles
……
1111: 16 HCLK clock cycles
Note: In synchronous operation, this parameter is meaningless and
is always 1 memory clock cycle
15:8
DATASETCFG
R/W
Data-Setup Time Configure
Only apply to NOR flash memory operation in SRAM, ROM and
asynchronous bus multiplexing mode.
0000 0000: Reserved
0000 0001: 2 HCLK clock cycles
0000 0010: 3 HCLK clock cycles
……
1111 1111: 256 HCLK clock cycles
19:16
BUSTURNCFG
R/W
Bus Turnaround Phase Duration Configure
These bits are used to configure the delay time on the bus after a
read operation. They are only applicable to NOR flash memory
operation in bus multiplexing mode.
0000: 1 HCLK clock cycle
0001: 2 HCLK clock cycles