參數(shù)資料
型號: AT89C51RB2-RLRIM
廠商: Atmel
文件頁數(shù): 48/127頁
文件大小: 0K
描述: IC MCU FLASH 8051 16K 5V 44-VQFP
標(biāo)準(zhǔn)包裝: 1
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LQFP
包裝: 剪切帶 (CT)
配用: AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名稱: AT89C51RB2RLRIMCT
27
AT89C51RB2/RC2
4180E–8051–10/06
Figure 9. Auto-Reload Mode Up/Down Counter (DCEN = 1)
Programmable Clock-out
Mode
In the clock-out mode, Timer 2 operates as a 50% duty-cycle, programmable clock gen-
erator (see Figure 10). The input clock increments TL2 at frequency F
CLK PERIPH/2. The
timer repeatedly 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 interrupts. 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.
It is possible to use Timer 2 as a baud rate generator and a clock generator simulta-
neously. For this configuration, the baud rates and clock frequencies are not
independent since both functions use the values in the RCAP2H and RCAP2L registers.
(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 O
– utFrequency
F
CLKPERIPH
4
65536
RCAP2HRCAP2L
)
(
×
---------------------------------------------------------------------------------------------
=
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