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參數(shù)資料
| 型號(hào)： | D87C51 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, UVPROM, 12 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | CERDIP-40 |
| 文件頁(yè)數(shù)： | 5/21頁(yè) |
| 文件大小： | 284K |
| 代理商： | D87C51 |
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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 V
SS
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 V
CC
for internal program
execution.
This pin also receives the programming supply volt-
age (V
PP
) during EPROM programming.
XTAL1
: Input to the inverting oscillator amplifier.
XTAL2
: Output from the inverting oscillator amplifi-
er.
272335–5
Figure 3. Using the On-Chip Oscillator
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 V
IL
and V
IH
specifications the capacitance will not ex-
ceed 20 pF.
272335–6
Figure 4. External Clock Drive
5
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