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参数资料
型号： AT89C51AC2-RLTUM
厂商： Atmel
文件页数： 78/121页
文件大小： 0K
描述： IC 8051 MCU FLASH 32K 44VQFP
产品培训模块： MCU Product Line Introduction
标准包装： 800
系列： 89C
核心处理器： 8051
芯体尺寸： 8-位
速度： 40MHz
连通性： UART/USART
外围设备： POR，PWM，WDT
输入/输出数： 34
程序存储器容量： 32KB（32K x 8）
程序存储器类型： 闪存
EEPROM 大小： 2K x 8
RAM 容量： 1.25K x 8
电压 - 电源 (Vcc/Vdd)： 3 V ~ 5.5 V
数据转换器： A/D 8x10b
振荡器型： 外部
工作温度： -40°C ~ 85°C
封装/外壳： 44-LQFP
包装： 托盘
产品目录页面： 616 (CN2011-ZH PDF)
配用： AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
6
A/T89C51AC2
4127H–8051–02/08
I/O Configurations
Each Port SFR operates via type-D latches, as illustrated in Figure 1 for Ports 3 and 4. A
CPU "write to latch" signal initiates transfer of internal bus data into the type-D latch. A
CPU "read latch" signal transfers the latched Q output onto the internal bus. Similarly, a
"read pin" signal transfers the logical level of the Port pin. Some Port data instructions
activate the "read latch" signal while others activate the "read pin" signal. Latch instruc-
tions are referred to as Read-Modify-Write instructions. Each I/O line may be
independently programmed as input or output.
Port 1, Port 3 and Port 4
Figure 1 shows the structure of Ports 1 and 3, which have internal pull-ups. An external
source can pull the pin low. Each Port pin can be configured either for general-purpose
I/O or for its alternate input output function.
To use a pin for general-purpose output, set or clear the corresponding bit in the Px reg-
ister (x = 1,3 or 4). To use a pin for general-purpose input, set the bit in the Px register.
This turns off the output FET drive.
To configure a pin for its alternate function, set the bit in the Px register. When the latch
is set, the "alternate output function" signal controls the output level (see Figure 1). The
operation of Ports 1, 3 and 4 is discussed further in the "quasi-Bidirectional Port Opera-
tion" section.
Figure 1. Port 1, Port 3 and Port 4 Structure
Note:
The internal pull-up can be disabled on P1 when analog function is selected.
Port 0 and Port 2
Ports 0 and 2 are used for general-purpose I/O or as the external address/data bus. Port
0, shown in Figure 3, differs from the other Ports in not having internal pull-ups. Figure 3
shows the structure of Port 2. An external source can pull a Port 2 pin low.
To use a pin for general-purpose output, set or clear the corresponding bit in the Px reg-
ister (x = 0 or 2). To use a pin for general-purpose input, set the bit in the Px register to
turn off the output driver FET.
D
CL
Q
P1.X
LATCH
INTERNAL
WRITE
TO
LATCH
READ
PIN
READ
LATCH
P1.x
P3.X
P4.X
ALTERNATE
OUTPUT
FUNCTION
VCC
INTERNAL
PULL-UP (1)
ALTERNATE
INPUT
FUNCTION
P3.x
P4.x
BUS
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相关代理商/技术参数
参数描述
AT89C51AC2SLSUM 制造商:Adesto Technologies Corporation 功能描述:
AT89C51AC2-SLSUM 功能描述:8位微控制器 -MCU C51AC2 32K FLASHADC EEP 5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT89C51AC3 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Enhanced 8-bit Microcontroller with 64KB Flash Memory
AT89C51AC3_04 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontrollers
AT89C51AC3_05 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Enhanced 8-bit Microcontroller with 64KB Flash Memory
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