参数资料
型号: AT80C51RD2-SLSUM
厂商: Atmel
文件页数: 10/81页
文件大小: 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-PLCC
标准包装: 972
系列: 80C
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: 32
程序存储器类型: ROMless
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-PLCC
包装: 管件
18
4113D–8051–01/09
AT80C51RD2
Figure 9-1.
Auto-Reload Mode Up/Down Counter (DCEN = 1)
9.2
Programmable Clock-Output
In the clock-out mode, Timer 2 operates as a 50% duty-cycle, programmable clock generator
(see Figure 9-2). The input clock increments TL2 at frequency F
CLK PERIPH/2. The timer repeat-
edly counts to overflow from a loaded value. At overflow, the contents of RCAP2H and RCAP2L
registers are loaded into TH2 and TL2. In this mode, Timer 2 overflows do not generate inter-
rupts. The formula gives the clock-out frequency as a function of the system oscillator frequency
and the value in the RCAP2H and RCAP2L registers:
For a 16 MHz system clock, Timer 2 has a programmable frequency range of 61 Hz
(F
CLK PERIPH/2
16) to 4 MHz (F
CLK PERIPH/4). The generated clock signal is brought out to T2 pin
(P1.0).
Timer 2 is programmed for the clock-out mode as follows:
Set T2OE bit in T2MOD register.
Clear C/T2 bit in T2CON register.
Determine the 16-bit reload value from the formula and enter it in RCAP2H/RCAP2L
registers.
Enter a 16-bit initial value in timer registers TH2/TL2. It can be the same as the reload value
or a different one depending on the application.
To start the timer, set TR2 run control bit in T2CON register.
(DOWN COUNTING RELOAD VALUE)
C/T2
TF2
TR2
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
F
CLK PERIPH
0
1
T2CON
T2EX:
if DCEN = 1, 1 = UP
if DCEN = 1, 0 = DOWN
if DCEN = 0, up counting
:6
Clock OutFrequency
FCLKPERIPH
4
65536
RCAP2H
RCAP2L
()
×
-----------------------------------------------------------------------------------------
=
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