Register Descriptions; Flash Access Control Register (Flash_Acr); Table 9. Abbreviations - ST STM32F101xx series Programming Manual

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Register descriptions

In this section, the following abbreviations are used:
Table 9.
Abbreviation
read/write (rw)
read-only (r)
write-only (w)
read/clear (rc_w0)
read/set (rs)
Reserved (Res.)
Note: The Flash memory registers have to be accessed by 32-bit words (half-word and byte
accesses are not allowed).
3.1

Flash access control register (FLASH_ACR)

Address offset: 0x00
Reset value: 0x0000 0030
31 30 29
15 14 13
Bits 31:6 Reserved, must be kept cleared.
Bit 5 PRFTBS: Prefetch buffer status
Abbreviations
Meaning
Software can read from and write to these bits.
Software can only read these bits.
Software can only write to this bit. Reading the bit returns the reset
value.
Software can read as well as clear this bit by writing '0'. Writing '1' has
no effect on the bit value.
Software can read as well as set this bit. Writing '0' has no effect on
the bit value.
Reserved bit, must be kept at reset value.
28 27 26 25
12 11 10 9
Reserved
This bit provides the status of the prefetch buffer.
0: Prefetch buffer is disabled
1: Prefetch buffer is enabled
24 23 22
Reserved
8 7 6
Doc ID 17863 Rev 1
Register descriptions
21 20 19 18
5 4 3 2
PRFT PRFT HLF
BS BE CYA
r rw rw rw
17 16
1 0
LATENCY
rw rw
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