參數(shù)資料
型號(hào): AT89C51ED2-SMSUM
廠商: Atmel
文件頁數(shù): 63/137頁
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 68PLCC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 304
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): 50
程序存儲(chǔ)器容量: 64KB(64K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 2K 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: 68-PLCC
包裝: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
31
4235K–8051–05/08
AT89C51RD2/ED2
Figure 12-1. Auto-reload Mode Up/Down Counter (DCEN = 1)
12.2
Programmable
Clock-output
In the clock-out mode, Timer 2 operates as a 50% duty-cycle, programmable clock generator
(See Figure 12-2). The input clock increments TL2 at frequency FCLK 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
(FCLK 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
FCLK 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
RCAP
2H RCAP2L
)
(
×
---------------------------------------------------------------------------------------------
=
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