 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
USB97C102 датащи(PDF) 30 Page - SMSC Corporation |
|
|
|||||||||||||||||||||||||||||
USB97C102 датащи(HTML) 30 Page - SMSC Corporation |
|
|
30 / 80 page  SMSC DS – USB97C102 Page 30 Rev. 03/23/2000 Table 37 - ISA Bus Status Register BUS_STAT (0x7F73 - RESET=0xXX) ISA BUS STATUS REGISTER BIT NAME R/W DESCRIPTION 7 CH3RQ R Channel 3 DMA Request 0 = No Request Pending 1 = Request Pending 6 CH2RQ R Channel 2 DMA Request 0 = No Request Pending 1 = Request Pending 5 CH1RQ R Channel 1 DMA Request 0 = No Request Pending 1 = Request Pending 4 CH0RQ R Channel 0 DMA Request 0 = No Request Pending 1 = Request Pending 3 CH3TC R Channel 3 Terminal Count Reached 0 = No 1 = Yes 2 CH2TC R Channel 2 Terminal Count Reached 0 = No 1 = Yes 1 CH1TC R Channel 1 Terminal Count Reached 0 = No 1 = Yes 0 CH0TC R Channel 0 Terminal Count Reached 0 = No 1 = Yes Note 1: Each bit in this register reflects the current value of the corresponding bit in the 8237 CH_STAT status register. Note 2: The 8237 clears bits 3..0 in the CH_STAT status register when the 8051 reads it through the ISA Bus I/O Window. Note 3: Reading the BUS_STAT register does not clear or otherwise affect the BUS_STAT register. Note 4: The ISADMA bit in ISR_0 is latched high whenever any bit in BUS_STAT that is enabled in BUS_MASK transitions from low to high. Note 5: This register is intended (1) to provide a view into the status of the 8237 without having to assume control of the ISA bus during DMA transfers, and (2) to provide a means for generating the ISADMA interrupt in ISR_0 which indicates that a DMA transfer has completed and that the 8051 should take control of the bus and setup the 8237 for its next transfer. Bits 7-4 can be used to generate additional interrupt requests from the DREQ pins, or simply to monitor channel request status by masking them. |
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю 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 |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
