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TP80C58 Fiches technique(PDF) 6 Page - Intel Corporation

No de pièce TP80C58
Description  CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Download  23 Pages
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Fabricant  INTEL [Intel Corporation]
Site Internet  http://www.intel.com
Logo INTEL - Intel Corporation

TP80C58 Fiches technique(HTML) 6 Page - Intel Corporation

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8XC525458
Table 2 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
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 8XC5X either a hardware reset or an 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 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 and INT1 must be
enabled 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 window on the D87C5X must be covered by
an opaque label Otherwise the DC and AC char-
acteristics may not be met and the device may
be functionally impaired
 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 8XC5X
without the 8XC5X having to be removed 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 8XC5X 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
NOTE
For more detailed information on the reduced power modes refer to current Embedded Microcontrollers and Processors
Handbook Volume I (Order No 270645) and Application Note AP-252 (Embedded Applications Handbook Order No
270648) ‘‘Designing with the 80C51BH’’
6


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