參數(shù)資料
型號： AT80C51RD2-SLSUM
廠商： Atmel
文件頁數(shù)： 34/81頁
文件大小： 0K
描述： IC 8051 MCU 5V SPI 20MHZ 44-PLCC
標(biāo)準(zhǔn)包裝： 972
系列： 80C
核心處理器： 8051
芯體尺寸： 8-位
速度： 40MHz
連通性： UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器類型： ROMless
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-PLCC
包裝： 管件
4
4113D–8051–01/09
AT80C51RD2
Table 3-1.
Pin Description
Mnemonic
Pin Number
Type
Name and Function
DIL
PLCC44
VQFP44 1.4
V
SS
20
22
16
I
Ground: 0V reference
V
CC
40
44
38
I
Power Supply: This is the power supply voltage for normal, idle and power-down
operation
P0.0 - P0.7
39 - 32
43 - 36
37 - 30
I/O
Port 0: Port 0 is an open-drain, bi-directional I/O port. Port 0 pins that have 1s
written to them float and can be used as high impedance inputs. Port 0 must be
polarized to V
CC or VSS in order to prevent any parasitic current consumption. Port
0 is also the multiplexed low-order address and data bus during access to external
program and data memory. In this application, it uses strong internal pull-up when
emitting 1s. Port 0 also inputs the code bytes during EPROM programming.
External pull-ups are required during program verification during which P0 outputs
the code bytes.
P1.0 - P1.7
1 - 8
2 - 9
40 - 44
1 - 3
I/O
Port 1: Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 pins
that have 1s written to them are pulled high by the internal pull-ups and can be
used as inputs. As inputs, Port 1 pins that are externally pulled low will source
current because of the internal pull-ups. Port 1 also receives the low-order address
byte during memory programming and verification.
Alternate functions for T89C51RB2/RC2 Port 1 include:
1
2
40
I/O
P1.0: Input/Output
I/O
T2 (P1.0): Timer/Counter 2 external count input/Clockout
2
3
41
I/O
P1.1: Input/Output
I
T2EX: Timer/Counter 2 Reload/Capture/Direction Control
3
4
42
I/O
P1.2: Input/Output
I
ECI: External Clock for the PCA
4
5
43
I/O
P1.3: Input/Output
I/O
CEX0: Capture/Compare External I/O for PCA module 0
5
6
44
I/O
P1.4: Input/Output
I/O
CEX1: Capture/Compare External I/O for PCA module 1
6
7
1
I/O
P1.5: Input/Output
I/O
CEX2: Capture/Compare External I/O for PCA module 2
7
8
2
I/O
P1.6: Input/Output
I/O
CEX3: Capture/Compare External I/O for PCA module 3
8
9
3
I/O
P1.7: Input/Output:
I/O
CEX4: Capture/Compare External I/O for PCA module 4
XTAL1
19
21
15
I
Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock
generator circuits.
XTAL2
18
20
14
O
Crystal 2: Output from the inverting oscillator amplifier
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