MCS@51
CONTROLLER
Table 1. EXPRESS Prefix Identification
Prefix
P
D
N
TD
TP
TN
LD
LP
Package Type
Plastic
Cerdip
PLCC
Cerdip
Plastic
PLCC
Cerdip
Plastic
Temperature Range
Commercial
Commercial
Commercial
Extended
Extended
Extended
Extended
Extended
Burn-In
No
No
No
No
No
No
Yes
Yes
NOTE:
Contactdistributoror localsalesofficeto matchEXPRESS
prefixwith properdevice.
DESIGN CONSIDERATIONS
If an 8751 BH or 8752BH is replacing an 8751 H in
a future design, the user should carefully com-
pare both data sheets for DC or AC Characteris-
tic differences. Note that the VIH and IIH specifi-
cations for the ~ pin differ significantly between
the devices.
Exposure to light when the EPROM device is in
operation may cause logic errors. For this reason,
it is suggested that an opaque label be placed
over the window when the die is exposed to am-
bient light.
q
The 8051AHP cannot access external Program
or Data memory above 4K. This means that the
following instructions that use the Data Pointer
only read/write data at address locations below
OFFFH:
MOVX A,@DPTR
MOVX (6JDPTR,
A
When the Data Pointer contains an address
above the 4K limit, those locations will not be ac-
cessed.
To access Data Memory above 4K, the
MOVX @Ri,A or MOVX A,@Ri instructions must
be used.
6
INTEL [ INTEL CORPORATION ]
