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参数资料
| 型号： | BN87C51FA12 |
| 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, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 14/18页 |
| 文件大小： | 254K |
| 代理商： | BN87C51FA12 |
AUTOMOTIVE 87C51FAFBFCFC-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 IO 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
P30
RXD (serial input port)
P31
TXD (serial output port)
P32
INT0 (external interrupt 0)
P33
INT1 (external interrupt 1)
P34
T0 (Timer 0 external input)
P35
T1 (Timer 1 external input)
P36
WR (external data memory write strobe)
P37
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
ALEPROG
Address Latch Enable output pulse for
latching the low byte of the address during accesses
to external memory This pin (ALEPROG) is also
the program pulse input during EPROM program-
ming for the 87C51FAFBFC
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 ALEPROG
pin and the pin will be referred to as the ALEPROG
pin
PSEN
Program Store Enable is the read strobe to
external Program Memory
When the 87C51FAFBFC 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 VPP 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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