W78E516DDG Datasheet, PDF (66/90 Pages) Nuvotem Talema – 8-BIT MICROCONTROLLER

W78E516D/W78E058D Data Sheet
gramming function. Then you can use this F04KBOOT mode to force the W78E516D/W78E058D
jump to LDROM and run on chip programming procedure. When you design your system, you can
connect the pins P26, P27 to switches or jumpers. For example in a CD ROM system, you can con-
nect the P26 and P27 to PLAY and EJECT buttons on the panel. When the APROM program is fail to
execute the normal application program. User can press both two buttons at the same time and then
switch on the power of the personal computer to force the W78E516D/W78E058D to enter the
F04KBOOT mode. After power on of personal computer, you can release both PLAY and EJECT but-
ton.
NOTE2: In application system design, user must take care the P2, P3, ALE, /EA and /PSEN pin value
at reset to avoid W78E516D/W78E058D entering the programming mode or F04KBOOT mode in
normal operation.
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