 |
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 |
|
AT89C5131A-RDTIL 数据表(PDF) 157 Page - ATMEL Corporation |
|
|
|||||||||||||||||||||||||||||
AT89C5131A-RDTIL 数据表(HTML) 157 Page - ATMEL Corporation |
|
|
157 / 184 page  157 AT89C5131A-L 4338F–USB–08/07 ONCE Mode (ON Chip Emulation) The ONCE mode facilitates testing and debugging of systems using AT89C5131A-L without removing the circuit from the board. The ONCE mode is invoked by driving cer- tain pins of the AT89C5131A-L; the following sequence must be exercised: • Pull ALE low while the device is in reset (RST high) and PSEN is high. • Hold ALE low as RST is deactivated. While the AT89C5131A-L is in ONCE mode, an emulator or test CPU can be used to drive the circuit Table 111 shows the status of the port pins during ONCE mode. Normal operation is restored when normal reset is applied. Table 111. External Pin Status during ONCE Mode ALE PSEN Port 0 Port 1 Port 2 Port 3 Port I2 XTAL1/2 Weak pull-up Weak pull-up Float Weak pull-up Weak pull-up Weak pull-up Float Active |
|
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
