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PDF TD87C51 Data sheet ( Hoja de datos )

Número de pieza TD87C51
Descripción (TD87C51 / TD87C31) CHMOS Single-Chip 8-Bit Microcontroller
Fabricantes Intel 
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No Preview Available ! TD87C51 Hoja de datos, Descripción, Manual

87C51/80C51BH/80C31BH
CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER
Commercial/Express
87C51/80C51BH/80C51BHP/80C31BH
*See Table 1 for Proliferation Options
High Performance CHMOS EPROM
24 MHz Operation
Improved Quick-Pulse Programming
Algorithm
3-Level Program Memory Lock
Boolean Processor
128-Byte Data RAM
32 Programmable I/O Lines
Two 16-Bit Timer/Counters
Extended Temperature Range
(-40°C to +85 °C)
5 Interrupt Sources
Programmable Serial Port
TTL- and CMOS-Compatible Logic
Levels
64K External Program Memory Space
64K External Data Memory Space
ONCE Mode Facilitates System Testing
Power Control Modes
Idle
Power Down
MEMORY ORGANIZATION
PROGRAM MEMORY: Up to 4 Kbytes of the program memory can reside on-chip (except 80C31BH). In
addition the device can address up to 64K of program memory external to the chip.
DATA MEMORY: This microcontroller has a 128 x 8 on-chip RAM. In addition it can address up to 64 Kbytes of
external data memory.
The Intel 87C51/80C51BH/80C31BH is a single-chip control-oriented microcontroller which is fabricated on
Intel's reliable CHMOS III-E technology. Being a member of the MCS® 51 controller family, the
87C51/80C51BH/80C31BH uses the same powerful instruction set, has the same architecture, and is pin-for-
pin compatible with the existing MCS 51 controller family of products.
The 80C51BHP is identical to the 80C51BH. When ordering the 80C51BHP, customers must submit the 64
byte encryption table together with the ROM code. Lock bit 1 will be set to enable the internal ROM code
protection and at the same time allows code verification.
The extremely low operating power, along with the two reduced power modes, Idle and Power Down, make
this part very suitable for low power applications. The Idle mode freezes the CPU while allowing the RAM,
timer/counters, serial port and interrupt system to continue functioning. The Power Down mode saves the
RAM contents but freezes the oscillator, causing all other chip functions to be inoperative.
For the remainder of this document, the 87C51, 80C51BH, and 80C31BH will be referred to as the 87C51/BH,
unless information applies to a specific device.
* Other brands and names are the property of their respective owners.
Information in this document is provided in connection with Intel products. Intel assumes no liability whatsoever, including infringement of any patent or
copyright, for sale and use of Intel products except as provided in Intel's Terms and Conditions of Sale for such products. Intel retains the right to make
changes to these specifications at any time, without notice. Microcomputer Products may have minor variations to this specification known as errata.
COPYRIGHT © INTEL CORPORATION, 2004
July 2004
Order Number: 272335-004
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TD87C51 pdf
87C51/80C51BH/80C31BH
In normal operation ALE is emitted at a constant
rate of 1/6 the oscillator frequency, and may be
used for external timing or clocking purposes. Note,
however, that one ALE pulse is skipped during each
access to external Data Memory.
PSEN: Program Store Enable is the Read strobe to
External Program Memory. When the 87C51/BH is
executing from Internal Program Memory, PSEN is
inactive (high). When the device is executing code
from External Program Memory, PSEN is activated
twice each machine cycle, except that two PSEN
activations are skipped during each access to Exter-
nal Data Memory.
EA/V PP: External Access enable. EA must be
strapped to VSS in order to enable the 87C51/BH to
fetch code from External Program Memory locations
starting at 0000H up to FFFFH. Note, however, that
if either of the Lock Bits is programmed, the logic
level at EA is internally latched during reset.
EA must be strapped to VCC for internal program
execution.
This pin also receives the programming supply volt-
age (VPP) during EPROM programming.
XTAL1 : Input to the inverting oscillator amplifier.
XTAL2 : Output from the inverting oscillator amplifi-
er.
OSCILLATOR CHARACTERISTICS
XTAL1 and XTAL2 are the input and output, respec-
tively, of an inverting amplifier which can be config-
ured for use as an on-chip oscillator, as shown in
Figure 3.
To drive the device from an external clock source,
XTAL1 should be driven, while XTAL2 is left uncon-
nected, as shown in Figure 4. There are no require-
ments on the duty cycle of the external clock signal,
since the input to the internal clocking circuitry is
through a divide-by-two flip-flop, but minimum and
maximum high and low times specified on the data
sheet must be observed.
An external oscillator may encounter as much as a
100 pF load at XTAL1 when it starts up. This is due
to interaction between the amplifier and its feedback
capacitance. Once the external signal meets the VIL
and VIH specifications the capacitance will not ex-
ceed 20 pF.
272335 ±6
Figure 4. External Clock Drive
272335 ±5
Figure 3. Using the On-Chip Oscillator
5
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TD87C51 arduino
87C51/80C51BH/80C31BH
272335 ±10
Figure 6. ICC Test Condition, Active Mode. All other pins are disconnected.
272335 ±8
Figure 7. ICC Test Condition, Idle Mode.
All other pins are disconnected.
272335 ±9
Figure 9. ICC Test Condition, Power Down
Mode. All other pins are disconnected.
VCC e 2V to 5.5V.
272335 ±11
Figure 8. Clock Signal Waveform for ICC Tests in Active and Idle Modes
TCLCH e TCHCL e 5 ns
11
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