 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
T89C51RD2-RDTIM 数据表(PDF) 77 Page - ATMEL Corporation |
|
|
|||||||||||||||||||||||||||||
T89C51RD2-RDTIM 数据表(HTML) 77 Page - ATMEL Corporation |
|
|
77 / 104 page  77 T89C51RD2 4243G–8051–05/03 1. In Page Load Mode the current byte is loaded on ALE rising edge. 2. After a power up all external test mode to program or to erase the Flash are locked to avoid any untimely programming or erasure. After each programming or erasure test mode, it’s advised to lock this feature (test mode PELCK). To validate the test mode mode PEULCK the following sequence has to be applied:Test Mode PEULCK with ALE = 1. Pulse on ALE (min width=25clk) with P0=55 (P0 latched on ALE rising edge) Pulse on ALE (min width=25clk) with P0=AA (P0 latched on ALE rising edge) 3. The highest security bit (bit 7) is used to secure the 7 lowest bit erasure. The only way to erase this bit is to erase the whole Flash memory. Procedure to program security bits (After array programming): - program bit7 to 0, program all other bits ( 1 = erased, 0 = programmed). - test mode PGMS (din = HSB). Procedure to erase security byte: - test mode CERR: erase all array included HSB. - program hardware security byte to FF: test mode PGMS (din = FF). Mode Name Mode P1[7..0] P2[5..0] P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 PELCK Program or Erase Lock. Disable the Erasure or Programming access xx xx xxx 1 x x PEULCK Program or Erase UnLock. Enable the Erasure or Programming access xx xx xxx 0 x x PGMC Write Code Data (byte) or write Page Always precedeed by PGML A7-A0 A13-A8 1 x x 0 A14 A15 PGML Memory Page Load (up to 128 bytes) A7-A0 A13-A8 1 x x 0 A14 A15 PGMV Read Code Data (byte) A7-A0 A13-A8 1 x x 1 A14 A15 VSB Read Security Byte (=HSB) xx xx 1 x x 1 x x PGMS Write lock Byte (Note 4) (security byte = HSB) xx xx 1 x x 0 x x CERR Chip Erase User + XAF xx xx 1 x x 0 x x PGXC Write Byte or Page Extra Memory (XAF) Always precedeed by PGXL A7-A0 (0-7F) xx 1 x x 0 x x PGXL Memory Page Load XAF (up to 128 bytes) A7-A0 (0-7F) xx 1 x x 1 x x TMS Read Signature bytes 30h (Manufacturer code) 31h (Device ID #1) 60h (Device ID #2) 61h (Device ID #3) 30h 31h 60h 61h x xxx 1 x x RXAF Read Extra Memory (XAF) Addr (0-7F) 00 1 x x 0 x x |
|
链接网址 |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 数据表链接 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| 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 |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
