参数资料
型号: AT89C51AC2-RLTUM
厂商: Atmel
文件页数: 85/121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
66
A/T89C51AC2
4127H–8051–02/08
Timer 2
The A/T89C51AC2 timer 2 is compatible with timer 2 in the 80C52.
It is a 16-bit timer/counter: the count is maintained by two eight-bit timer registers, TH2
and TL2 that are cascade- connected. It is controlled by T2CON register (See Table )
and T2MOD register (See Table 47). Timer 2 operation is similar to Timer 0 and Timer
1. C/T2 selects FT2 clock/6 (timer operation) or external pin T2 (counter operation) as
timer clock. Setting TR2 allows TL2 to be incremented by the selected input.
Timer 2 includes the following enhancements:
Auto-reload mode (up or down counter)
Programmable clock-output
Auto-Reload Mode
The auto-reload mode configures timer 2 as a 16-bit timer or event counter with auto-
matic reload. This feature is controlled by the DCEN bit in T2MOD register (See
Table 47). Setting the DCEN bit enables timer 2 to count up or down as shown in
Figure 36. In this mode the T2EX pin controls the counting direction.
When T2EX is high, timer 2 counts up. Timer overflow occurs at FFFFh which sets the
TF2 flag and generates an interrupt request. The overflow also causes the 16-bit value
in RCAP2H and RCAP2L registers to be loaded into the timer registers TH2 and TL2.
When T2EX is low, timer 2 counts down. Timer underflow occurs when the count in the
timer registers TH2 and TL2 equals the value stored in RCAP2H and RCAP2L registers.
The underflow sets TF2 flag and reloads FFFFh into the timer registers.
The EXF2 bit toggles when timer 2 overflow or underflow, depending on the direction of
the count. EXF2 does not generate an interrupt. This bit can be used to provide 17-bit
resolution.
Figure 36. Auto-Reload Mode Up/Down Counter
(DOWN COUNTING RELOAD VALUE)
TF2
T2
EXF2
TH2
(8-bit)
TL2
(8-bit)
RCAP2H
(8-bit)
RCAP2L
(8-bit)
FFh
(8-bit)
FFh
(8-bit)
TOGGLE
(UP COUNTING RELOAD VALUE)
TIMER 2
INTERRUPT
:6
T2CONreg
T2EX:
1=UP
2=DOWN
0
1
CT/2
T2CON.1
TR2
T2CON.2
FT2
CLOCK
see section “Clock”
相关PDF资料
PDF描述
VI-B24-IY-F3 CONVERTER MOD DC/DC 48V 50W
VI-B24-IY-F2 CONVERTER MOD DC/DC 48V 50W
VI-J1Y-IX-F4 CONVERTER MOD DC/DC 3.3V 49.5W
VJ2225A561KBAAT4X CAP CER 560PF 50V 10% NP0 2225
VI-B2N-IY-F1 CONVERTER MOD DC/DC 18.5V 50W
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