Electronic Components Datasheet Search |
|
W78E54-40 Datasheet(PDF) 4 Page - Winbond |
|
W78E54-40 Datasheet(HTML) 4 Page - Winbond |
4 / 23 page W78E54 - 4 - Flash No function in this mode. EA/VPP MODE DESCRIPTION Normal EA , External Access, Input, active low. This pin forces the processor to execute a program from the external ROM. When the internal flash EEPROM is accessed as in the W78C54, this pin should be kept high. Flash VPP, Program Power supply pin, Input. This pin accepts the high voltage (12V) needed for programming the flash EEPROM. RST MODE DESCRIPTION Normal RST, Reset, Input, active high. This pin resets the processor. It must be kept high for at least two machine cycles in order to be recognized by the processor. Flash Flash mode configuration pin, Input, active high. RST is used to configure the flash operations. For details, see Flash Operations. ALE MODE DESCRIPTION Normal ALE, Address Latch Enable, Output, active high. ALE is used to enable the address latch that separates the address from the data on Port 0. ALE runs at 1/6th of the oscillator frequency. A single ALE pulse is skipped during external data memory accesses. ALE goes to a high impedance state with a weak pull-up during reset state. Flash Flash mode configuration pin, Input, active low. ALE is used to configure the flash operations. For details, see Flash Operations. PSEN MODE DESCRIPTION Normal PSEN, Program Store Enable, Output, active low. This pin enables the external ROM onto the Port 0 address/data bus during fetch and MOVC operations. PSEN goes to a high impedance state with a weak pull-up during reset state Flash Flash mode configuration pin, Input, active high. PSEN is used to configure the flash operations. For details, see Flash Operations. XTAL1 MODE DESCRIPTION |
Similar Part No. - W78E54-40 |
|
Similar Description - W78E54-40 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |