 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
FDC37C78-HT Datasheet(PDF) 6 Page - Microchip Technology |
|
|
|||||||||||||||||||||||||||||
FDC37C78-HT Datasheet(HTML) 6 Page - Microchip Technology |
|
|
6 / 82 page  6 DESCRIPTION OF PIN FUNCTIONS DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION HOST PROCESSOR INTERFACE 2-5, 8-11 Data Bus 0-7 D0-D7 I/O12 The data bus connection used by the host microprocessor to transmit data to and from the chip. These pins are in a high-impedance state when not in the output mode. 46 I/O Read nIOR I This active low signal is issued by the host microprocessor to indicate a read operation. 47 I/O Write nIOW I This active low signal is issued by the host microprocessor to indicate a write operation. 44-42 I/O Address A0-A2 I These host address bits determine the I/O address to be accessed during nIOR and nIOW cycles. These bits are latched internally by the leading edge of nIOR and nIOW. 48 DMA Request DRQ O12 This active high output is the DMA request for byte transfers of data between the host and the chip. This signal is cleared on the last byte of the data transfer by the nDACK signal going low (or by nIOR going low if nDACK was already low as in demand mode). 1 n DMA Acknowledge nDACK I An active low input acknowledging the request for a DMA transfer of data between the host and the chip. This input enables the DMA read or write internally. 14 Terminal Count TC I This signal indicates to the chip that DMA data transfer is complete. TC is only accepted when nDACK is low. TC is active high. 13 Interrupt Request IRQ O12 The interrupt request from the logical device is output on the IRQ signal. Refer to the configuration registers for more information. 45 Chip Select Input nCS I When enabled, this active low pin serves as an input for an external decoder circuit which is used to qualify address lines above A2. |
Similar Part No. - FDC37C78-HT |
|
Similar Description - FDC37C78-HT |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
