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参数资料
| 型号： | BP87C51FB |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP40 |
| 封装： | PLASTIC, DIP-40 |
| 文件页数： | 14/18页 |
| 文件大小： | 1527K |
| 代理商： | BP87C51FB |
AUTOMOTIVE 87C51FA/FB/FC/FC-20
Port 2 emits the high-order address byte during
fetches from external Program Memory and during
accesses to external Data Memory that use 16-bit
addresses (MOVX
DPTR). In this application it
uses strong internal pullups when emitting 1's. Dur-
ing accesses to external Data Memory that use 8-bit
addresses (MOVX
Ri), Port 2 emits the contents
of the P2 Special Function Register.
Some Port 2 pins receive the high-order address bits
during EPROM programming and program verifica-
tion.
Port 3
: Port 3 is an 8-bit bidirectional I/O port with
internal pullups. The Port 3 output buffers can drive
LS TTL inputs. Port 3 pins that have 1's written to
them are pulled high by the internal pullups, and in
that state can be used as inputs. As inputs, Port 3
pins that are externally pulled low will source current
(IIL, on the data sheet) because of the pullups.
Port 3 also serves the functions of various special
features of the MCS-51 Family, as listed below:
Port Pin
Alternate Function
P3.0
RXD (serial input port)
P3.1
TXD (serial output port)
P3.2
INT0 (external interrupt 0)
P3.3
INT1 (external interrupt 1)
P3.4
T0 (Timer 0 external input)
P3.5
T1 (Timer 1 external input)
P3.6
WR (external data memory write strobe)
P3.7
RD (external data memory read strobe)
RST
: Reset input. A high on this pin for two machine
cycles while the oscillator is running resets the de-
vice. The port pins will be driven to their reset condi-
tion when a minimum VIH1 is applied, whether the
oscillator is running or not. An internal pulldown re-
sistor permits a power-on reset with only a capacitor
connected to VCC.
ALE/PROG
: Address Latch Enable output pulse for
latching the low byte of the address during accesses
to external memory. This pin (ALE/PROG ) is also
the program pulse input during EPROM program-
ming for the 87C51FA/FB/FC.
In normal operation ALE is emitted at a constant
rate of
the oscillator frequency, and may be used
for external timing or clocking purposes. Note, how-
ever, that one ALE pulse is skipped during each ac-
cess to external Data Memory.
Throughout the remainder of this data sheet, ALE
will refer to the signal coming out of the ALE/PROG
pin, and the pin will be referred to as the ALE/PROG
pin.
PSEN
: Program Store Enable is the read strobe to
external Program Memory.
When the 87C51FA/FB/FC is executing code from
external Program Memory, PSEN is activated twice
each machine cycle, except that two PSEN activa-
tions are skipped during each access to external
Data Memory.
EA/V PP: External Access enable. EA must be
strapped to VSS in order to enable the device to
fetch code from external Program Memory locations
0000H to 0FFFFH. Note, however, that if either of
the Program Lock bits are programmed, EA will be
internally latched on reset.
EA should be strapped to VCC for internal program
executions.
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 amplifier.
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 4. Either a quartz crystal or ceramic resonator
may be used. More detailed information concerning
the use of the on-chip oscillator is available in Appli-
cation Note AP-155, ``Oscillators for Microcontrol-
lers'', and in Application Note AP-486,
``Oscillator
Design for Microcontrollers''.
5
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