 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
X28HC64P-90 Datasheet(PDF) 4 Page - Intersil Corporation |
|
||||||||||||||||||||||||||||||
X28HC64P-90 Datasheet(HTML) 4 Page - Intersil Corporation |
|
|
4 / 17 page  4 FN8109.2 August 28, 2009 DATA Polling (I/O7) The X28HC64 features DATA Polling as a method to indicate to the host system that the byte write or page write cycle has completed. DATA Polling allows a simple bit test operation to determine the status of the X28HC64, eliminating additional interrupt inputs or external hardware. During the internal programming cycle, any attempt to read the last byte written will produce the complement of that data on I/O7 (i.e. write data = 0xxx xxxx, read data = 1xxx xxxx). Once the programming cycle is complete, I/O7 will reflect true data. Toggle Bit (I/O6) The X28HC64 also provides another method for determining when the internal write cycle is complete. During the internal programming cycle I/O6 will toggle from HIGH to LOW and LOW to HIGH on subsequent attempts to read the device. When the internal cycle is complete the toggling will cease and the device will be accessible for additional read or write operations. DATA Polling I/O7 DATA Polling can effectively reduce the time for writing to the X28HC64. The timing diagram in Figure 2 illustrates the sequence of events on the bus. The software flow diagram in Figure 3 illustrates one method of implementing the routine. CE OE WE I/O7 X28HC64 Ready Last Write HIGH Z VOL VIH A0–A12 An An An An An An VOH An FIGURE 2. DATA POLLING BUS SEQUENCE WRITE DATA SAVE LAST DATA AND ADDRESS READ LAST ADDRESS IO7 COMPARE? NO YES WRITES COMPLETE? NO YES READY FIGURE 3. DATA POLLING SOFTWARE FLOW X28HC64 |
Similar Part No. - X28HC64P-90 |
|
Similar Description - X28HC64P-90 |
|
|
|
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
