Intel MCS 51

i~e
87C51GB HARDWAREDESCRIPTION
STATS4 STATS5 STAT56 S7AT51 STATS2 STAT53 STAT54 STATE5
IPllmlPllmlmlml MlnlPllmlPllnlm lnlnlnl
XTALI:
‘“’ ~
~D:
1
PCLOUTIP
PaoGlwNMEMoRY
OATASANPLSO
ISEXTSRNAL
m:
i~ll
DPL~Rl
PLOAT
1
P3:
PCHOR
DPHORP3SPROUT
PCHOR
P3SPR
Psalm
270S97-8
Figure 6. External Data
MemoryReadCycie
SIAIE 4 STAIE 5 STA756 SIAIE 1 S7ATS2 STATS3 STATS4 STATS5
IPllJPtlPzlPl ,nlPl,nlnlmlmim lnlmlm IP31
xrALl:
‘“’ ~
*:
PCLOUTIP
PuoaRAMM5moRY
lsE31EnML
w:
LI
DPLORRI
DATAOUT
P3
PcHon
oP140nP3smou’f
Paion
P3sFa
PssFn
270S97-9
Figure7.ExternalDataMemoryWriteCycle
6-12