參數(shù)資料
型號(hào)： P80C52-33
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, OTPROM, 33 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁(yè)數(shù)： 4/23頁(yè)
文件大?。?/td> 319K
代理商： P80C52-33
8XC52/54/58
PIN DESCRIPTIONS
V
CC
:
Supply voltage.
V
SS
:
Circuit ground.
V
SS1
:
Secondary ground (not on DIP). Provided to
reduce ground bounce and improve power supply
by-passing.
NOTE:
This pin is not a substitute for the V
SS
pin (pin 22).
(Connection not necessary for proper operation.)
Port 0:
Port 0 is an 8-bit, open drain, bidirectional
I/O port. As an output port each pin can sink several
LS TTL inputs. Port 0 pins that have 1’s written to
them float, and in that state can be used as high-im-
pedance inputs.
Port 0 is also the multiplexed low-order address and
data bus during accesses to external Program and
Data Memory. In this application it uses strong inter-
nal pullups when emitting 1’s, and can source and
sink several LS TTL inputs.
Port 0 also receives the code bytes during EPROM
programming, and outputs the code bytes during
program verification. External pullup resistors are re-
quired during program verification.
Port 1:
Port 1 is an 8-bit bidirectional I/O port with
internal pullups. The Port 1 output buffers can drive
LS TTL inputs. Port 1 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 1
pins that are externally pulled low will source current
(I
IL
, on the data sheet) because of the internal pull-
ups.
In addition, Port 1 serves the functions of the follow-
ing special features of the 8XC5X:
Port Pin
Alternate Function
P1.0
T2 (External Count Input to Timer/
Counter 2), Clock-Out
P1.1
T2EX (Timer/Counter 2 Capture/
Reload Trigger and Direction Control)
Port 1 receives the low-order address bytes during
EPROM programming and verifying.
Port 2:
Port 2 is an 8-bit bidirectional I/O port with
internal pullups. The Port 2 output buffers can drive
LS TTL inputs. Port 2 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 2
pins that are externally pulled low will source current
(I
IL
, on the data sheet) because of the internal pull-
ups.
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
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.
@
DPTR). In this application it
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
(I
IL
, on the data sheet) because of the pullups.
Port 3 also serves the functions of various special
features of the 8051 Family, as listed below:
Port Pin
Alternate Function
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
RXD (serial input port)
TXD (serial output port)
INT0 (external interrupt 0)
INT1 (external interrupt 1)
T0 (Timer 0 external input)
T1 (Timer 1 external input)
WR (external data memory write strobe)
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 V
IHI
voltage is applied whether
the oscillator is running or not. An internal pulldown
resistor permits a power-on reset with only a capaci-
tor connected to V
CC
.
ALE:
Address Latch Enable output pulse for latching
the low byte of the address during accesses to ex-
ternal memory. This pin (ALE/PROG) is also the
program pulse input during EPROM programming for
the 87C5X.
In normal operation ALE is emitted at a constant
rate of
(/6
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.
4
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