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參數(shù)資料
| 型號： | S83C51RA-1 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 1665K |
| 代理商： | S83C51RA-1 |
8XC51RARBRC
PIN DESCRIPTIONS
VCC Supply voltage
VSS Circuit ground
VSS1 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 VSS pin (pin 22)
(Connection not necessary for proper operation)
Port 0
Port 0 is an 8-bit open drain bidirectional
IO 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 IO 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
(IIL 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 8XC51RX
Port Pin
Alternate Function
P10
T2 (External Count Input to Timer
Counter 2) Clock-Out
P11
T2EX (TimerCounter 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 IO 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
(IIL 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
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 8051 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 IO 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 VIHI 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 VCC After a WatchDog Timer over-
flow this RST pin will drive an output high pulse at a
minimum VOH2 for 96 x TOSC duration while the in-
ternal reset signal is active
ALE
Address Latch Enable output pulse for latching
the low byte of the address during accesses to ex-
4
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S83C51RA | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP44 |
| S83C51RC-1 | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| S87C51RA-20 | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PQFP44 |
| S87C51RA-24 | 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP44 |
| S87C51RB-1 | 8-BIT, OTPROM, 16 MHz, MICROCONTROLLER, PQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S83C51RA-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| S83C51RA-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| S83C51RB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| S83C51RB-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| S83C51RB-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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