AT89C52微控制器技术手册：8KISP Flash内存

4星 · 超过85%的资源需积分: 10 55 浏览量更新于2024-07-27 收藏 234KB PDF 举报

"AT89C52技术手册提供了一份详细的技术文档，涵盖了这款微控制器的主要特性和功能。手册包括了AT89C52与MCS-51产品系列的兼容性、内置的ISP Flash Memory、操作电压范围、静态运行能力、程序存储锁功能、内部RAM、可编程I/O线路、定时器/计数器、中断源、串行通信通道、低功耗模式以及电源管理特性等。" AT89C52是一款基于CMOS技术的8位低功耗高性能微控制器，由Atmel公司制造。它最大的特点是拥有8K字节的在系统可编程(ISP)Flash内存，能够承受1000次的写入/擦除周期，这使得程序在设备上可以直接进行更新，无需从电路板上移除芯片。在电源方面，AT89C52可在4.0V至5.5V的电压范围内工作，而且能实现全静态操作，这意味着即使在低至0Hz的时钟频率下也能正常运行，最高可达33MHz的时钟速度。这种灵活性适应了各种应用场合的需求。该微控制器拥有256x8位的内部RAM，为数据处理提供了足够的空间。同时，它还配备了32条可编程的输入/输出线路，允许灵活配置I/O端口以适应不同的外设连接。此外，AT89C52包含了三个16位的定时器/计数器，这些定时器可以用于定时任务、脉冲计数或波特率发生器等多种功能。在中断系统方面，AT89C52有八个中断源，可以处理来自不同硬件模块的中断请求，增强了实时响应的能力。它还配备了一个全双工UART（通用异步收发传输器）串行通信通道，支持串行数据传输。为了节能，AT89C52具备低功耗闲置模式和电源下降模式。在电源下降模式下，微控制器可以进入休眠状态，但中断恢复功能允许它在外部事件触发时重新激活。此外，它还具有看门狗定时器，以确保系统稳定运行，防止程序卡死。 AT89C52还拥有双数据指针，这在处理大量数据时非常有用。它还包含一个电源关闭标志，用于记录电源状态，这对于需要在断电后恢复操作的应用特别重要。 AT89C52是一个功能强大的8位微控制器，结合了通用的80C51指令集、在系统编程能力和丰富的片上资源，为设计者提供了经济且高度灵活的解决方案，适用于各种嵌入式控制系统设计。

AT89S52

Special Function Registers

A map of the on-chip memory area called the Special Func-

tion Register (SFR) space is shown in Table 1.

Note that not all of the addresses are occupied, and unoc-

cupied addresses may not be implemented on the chip.

Read accesses to these addresses will in general return

random data, and write accesses will have an indetermi-

nate effect.

User software should not write 1s to these unlisted loca-

tions, since they may be used in future products to invoke

new features. In that case, the reset or inactive values of

the new bits will always be 0.

Timer 2 Registers: Control and status bits are contained in

registers T2CON (shown in Table 2) and T2MOD (shown in

Table 3) for Timer 2. The register pair (RCAP2H, RCAP2L)

are the Capture/Reload registers for Timer 2 in 16-bit cap-

ture mode or 16-bit auto-reload mode.

Interrupt Registers: The individual interrupt enable bits

are in the IE register. Two priorities can be set for each of

the six interrupt sources in the IP register.

Table 2. T2CON – Timer/Counter 2 Control Register

T2CON Address = 0C8H Reset Value = 0000 0000B

Bit Addressable

Bit TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2

CP/RL2

76543210

Symbol Function

TF2 Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2 will not be set when either RCLK = 1

or TCLK = 1.

EXF2 Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and EXEN2 = 1.

When Timer 2 interrupt is enabled, EXF2 = 1 will cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must be

cleared by software. EXF2 does not cause an interrupt in up/down counter mode (DCEN = 1).

RCLK Receive clock enable. When set, causes the serial port to use Timer 2 overflow pulses for its receive clock in serial port

Modes 1 and 3. RCLK = 0 causes Timer 1 overflow to be used for the receive clock.

TCLK Transmit clock enable. When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock in serial port

Modes 1 and 3. TCLK = 0 causes Timer 1 overflows to be used for the transmit clock.

EXEN2 Timer 2 external enable. When set, allows a capture or reload to occur as a result of a negative transition on T2EX if Timer

2 is not being used to clock the serial port. EXEN2 = 0 causes Timer 2 to ignore events at T2EX.

TR2 Start/Stop control for Timer 2. TR2 = 1 starts the timer.

C/T2

Timer or counter select for Timer 2. C/T2 = 0 for timer function. C/T2 = 1 for external event counter (falling edge triggered).

CP/RL2

Capture/Reload select. CP/RL2 = 1 causes captures to occur on negative transitions at T2EX if EXEN2 = 1. CP/RL2 = 0

causes automatic reloads to occur when Timer 2 overflows or negative transitions occur at T2EX when EXEN2 = 1. When

either RCLK or TCLK = 1, this bit is ignored and the timer is forced to auto-reload on Timer 2 overflow.

剩余29页未读，继续阅读

zhang1432302881

粉丝: 0
资源: 6

AT89C52微控制器技术手册：8KISP Flash内存

AT89C52中文手册

AT89C52中文资料

AT89C52的使用手册

英文版at89c52数据手册PDF

PWM.rar_AT89C52 PWM_At89c52按键_at89c52_at89c52 pwm_按键PWM

AT89C52单片机资料手册

at89c51 at89c52 at89s52中文资料

at89C52 中文资料

AT89C52 DATA SHEET

AT89C52.pdf

最新资源