công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

Preview PDF HTML

PM0073 bảng dữ liệu(PDF) 13 Page - STMicroelectronics

tên linh kiện PM0073
Giải thích chi tiết về linh kiện  STM32Wxxx Flash memory microcontrollers
PDF  34 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0073 bảng dữ liệu(HTML) 13 Page - STMicroelectronics

Back Button PM0073 Datasheet HTML 9Page - STMicroelectronics PM0073 Datasheet HTML 10Page - STMicroelectronics PM0073 Datasheet HTML 11Page - STMicroelectronics PM0073 Datasheet HTML 12Page - STMicroelectronics PM0073 Datasheet HTML 13Page - STMicroelectronics PM0073 Datasheet HTML 14Page - STMicroelectronics PM0073 Datasheet HTML 15Page - STMicroelectronics PM0073 Datasheet HTML 16Page - STMicroelectronics PM0073 Datasheet HTML 17Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 13 / 34 page
background image
PM0073
Reading/programming the STM32Wxxx embedded Flash memory
Doc ID 17766 Rev 5
13/34
2.1.3
Flash access controller
Mainly, this block is a simple arbiter between the read requests of the prefetch/I-code and D-
Code interfaces.
D-Code interface requests have priority over I-Code requests.
2.2
Flash program and erase controller (FPEC)
The FPEC block handles the program and erase operations of the Flash memory. The
FPEC consists of seven 32-bit registers.
●
FPEC key register (FLASH_KEYR)
●
Option byte key register (FLASH_OPTKEYR)
●
Flash control register (FLASH_CR)
●
Flash status register (FLASH_SR)
●
Flash address register (FLASH_AR)
●
Option byte register (FLASH_OBR)
●
Write protection register (FLASH_WRPR)
An ongoing Flash memory operation will not block the CPU as long as the CPU does not
access the Flash memory.
Note:
These registers can be accessed for writing only in Privileged mode.
2.2.1
Key values
The key values are as follows:
●
RDPRT key = 0x00A5
●
KEY1 = 0x45670123
●
KEY2 = 0xCDEF89AB
2.2.2
Unlocking the Flash memory
After reset, the FPEC block is protected. The FLASH_CR register is not accessible in write
mode. An unlocking sequence should be written to the FLASH_KEYR register to open up
the FPEC block. This sequence consists of two write cycles, where two key values (KEY1
and KEY2) are written to the FLASH_KEYR address (refer to Section 2.2.1: Key values for
key values). Any wrong sequence locks up the FPEC block and FLASH_CR register until
the next reset.
Also a bus error is returned on a wrong key sequence. This is done after the first write cycle
if KEY1 does not match, or during the second write cycle if KEY1 has been correctly written
but KEY2 does not match. The FPEC block and FLASH_CR register can be locked by the
user’s software by writing the LOCK bit of the FLASH_CR register to 1. In this case, the
FPEC can be unlocked by writing the correct sequence of keys into FLASH_KEYR.



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34


bảng dữ liệu tải về

Go To PDF Page


Link URL



Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Liên kết đến bảng dữ liệu    |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com