68
/
838
Nations Technologies Inc.
Tel
：
+86-755-86309900
：
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
Reset value: 0x0000 0030
Bit field
Name
Description
31:8
Reserved
Reserved, the reset value must be maintained.
7
ICAHEN
iCache enable
0: turn off iCache;
1: enable iCache.
6
ICAHRST
iCache reset
0: writing '0' is invalid;
1: write '1' to reset.
5
PRFTBFS
Prefetch buffer status
This bit indicates the status of the prefetch buffer
0: The prefetch buffer is closed;
1: The prefetch buffer is open.
4
PRFTBFE
Prefetch buffer enable
0: Close the prefetch buffer;
1: Enable prefetch buffer.
3
Reserved
Reserved, the reset value must be maintained.
2:0
LATENCY
time delay
These bits represent the ratio of SYSCLK (system clock) period to flash memory
access time.
000: zero period delay, when 0 < SYSCLK <=32MHz
001: one cycle delay, when 32MHz < SYSCLK <=64MHz
010: two cycle delay, when 64MHz < SYSCLK <=96MHz
011: three cycle delay, when 96MHz < SYSCLK <= 128MHz
011: three cycle delay, when 128MHz < SYSCLK <= 144MHz
Other values: reserved
3.2.5.2.2
The FLASH key register (FLASH_KEY)
Address offset: 0x04
Reset value: 0xXXXX XXXX
