參數(shù)資料
型號(hào): AT89S4051-24SU
廠商: Atmel
文件頁(yè)數(shù): 23/46頁(yè)
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 4K LF 20SOIC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 38
系列: 89S
核心處理器: 8051
芯體尺寸: 8-位
速度: 24MHz
連通性: UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM
輸入/輸出數(shù): 15
程序存儲(chǔ)器容量: 4KB(4K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 管件
其它名稱: Q2962974
3
3390E–MICRO–6/08
AT89S2051/S4051
4.
Pin Description
4.1
VCC
Supply voltage.
4.2
GND
Ground.
4.3
Port 1
Port 1 is an 8-bit bi-directional I/O port. Port pins P1.2 to P1.7 provide internal pull-ups. P1.0 and
P1.1 require external pull-ups. P1.0 and P1.1 also serve as the positive input (AIN0) and the
negative input (AIN1), respectively, of the on-chip precision analog comparator. The Port 1 out-
put buffers can sink 20 mA and can drive LED displays directly. When 1s are written to Port 1
pins, they can be used as inputs. When pins P1.2 to P1.7 are used as inputs and are externally
pulled low, they will source current (I
IL) because of the internal pull-ups.
Port 1 also receives code data during Flash programming and verification.
4.4
Port 3
Port 3 pins P3.0 to P3.5, P3.7 are seven bi-directional I/O pins with internal pull-ups.
P3.6 is hard-wired as an input to the output of the on-chip comparator and is not accessible as a
general-purpose I/O pin. The Port 3 output buffers can sink 20 mA. When 1s are written to Port
3 pins they are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 3
pins that are externally being pulled low will source current (I
IL) because of the pull-ups.
Port 3 also serves the functions of various special features of the AT89S2051/S4051 as listed
below:
Port 3 also receives some control signals for Flash programming and verification.
Port Pin
Alternate Functions
P1.5
MOSI (Master data output, slave data input pin for ISP channel)
P1.6
MISO (Master data input, slave data output pin for ISP channel)
P1.7
SCK (Master clock output, slave clock input pin for ISP channel)
Port Pin
Alternate Functions
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)/ PWM output
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