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8XL51FA Datasheet(PDF) 6 Page - Intel Corporation

No. de Pieza. 8XL51FA
Descripción  LOW VOLTAGE CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLERS
Descarga  20 Pages
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Fabricante  INTEL [Intel Corporation]
Página de inicio  http://www.intel.com
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8XL51FA Datasheet(HTML) 6 Page - Intel Corporation

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8XL51FAFBFC
POWER DOWN MODE
To save even more power a Power Down mode can
be invoked by software In this mode the oscillator
is stopped and the instruction that invoked Power
Down is the last instruction executed The on-chip
RAM and Special Function Registers retain their val-
ues until the Power Down mode is terminated
On the 8XL51FX either hardware reset or external
interrupt can cause an exit from Power Down Reset
redefines all the SFRs but does not change the on-
chip RAM An external interrupt allows both the
SFRs and the on-chip RAM to retain their values
To properly terminate Power Down the reset or ex-
ternal interrupt should not be executed before VCC is
restored to its normal operating level and must be
held active long enough for the oscillator to restart
and stabilize (normally less than 10 ms)
With an external interrupt INT0 or INT1 must be en-
abled and configured as level-sensitive Holding the
pin low restarts the oscillator but bringing the pin
back high completes the exit Once the interrupt is
serviced the next instruction to be executed after
RETI will be the one following the instruction that put
the device into Power Down
DESIGN CONSIDERATION
 The 8XL51FX will operate from 27V to 36V with
a frequency range of 35 MHz to 16 MHz (Ex-
press)20 MHz (Commercial) Operating beyond
these specifications could cause improper device
functionality
 All VCC and VSS pins must be connected Please
refer to Figure 2 Pin Connections for the specific
pins
 When the idle mode is terminated by a hardware
reset the device normally resumes program exe-
cution from where it left off up to two machine
cycles before the internal reset algorithm takes
control On-chip hardware inhibits access to inter-
nal RAM in this event but access to the port pins
is not inhibited To eliminate the possibility of an
unexpected write when Idle is terminated by re-
set the instruction following the one that invokes
Idle should not be one that writes to a port pin or
to external memory
ONCE MODE
The ONCE (‘‘On-Circuit Emulation’’) Mode facilitates
testing
and
debugging
of
systems
using
the
8XL51FX without the 8XL51FX having to be re-
moved from the circuit The ONCE Mode is invoked
by
1) Pull ALE low while the device is in reset and
PSEN is high
2) Hold ALE low as RST is deactivated
While the device is in ONCE Mode the Port 0 pins
float and the other port pins and ALE and PSEN are
weakly pulled high The oscillator circuit remains ac-
tive While the 8XL51FX is in this mode an emulator
or test CPU can be used to drive the circuit Normal
operation is restored when a normal reset is applied
Table 1 Status of the External Pins during Idle and Power Down
Mode
Program
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Memory
Idle
Internal
1
1
Data
Data
Data
Data
Idle
External
1
1
Float
Data
Address
Data
Power Down
Internal
0
0
Data
Data
Data
Data
Power Down
External
0
0
Float
Data
Data
Data
NOTE
For more detailed information on the reduced power modes refer to current Embedded Microcontrollers and Processors
Handbook Volume I
270646 and Application Note AP-252 (Embedded Applications Handbook)
270648 ‘‘Designing
with the 80C51BH’’
6


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