參數(shù)資料
型號(hào)： T89C51RD2-SLRCM
廠商： TEMIC SEMICONDUCTORS
元件分類(lèi)： 微控制器/微處理器
英文描述： 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 19/104頁(yè)
文件大?。?/td> 798K
代理商： T89C51RD2-SLRCM
19
T89C51RD2
4243G
–
8051
–
05/03
Figure 5.
Auto-Reload Mode Up/Down Counter (DCEN = 1)
Programmable Clock-Output
In the clock-out mode, timer 2 operates as a 50%-duty-cycle, programmable clock gen-
erator (See Figure 6) . The input clock increments TL2 at frequency F
OSC
/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
OSC
/2
16)
to 4 MHz (F
OSC
/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
FFh
(8-bit)
C/T2
T2CONreg
TF2
TR2
T2
EXF2
TH2
(8-bit)
TL2
(8-bit)
RCAP2H
(8-bit)
RCAP2L
(8-bit)
FFh
(8-bit)
TOGGL
(UP COUNTING RELOAD VALUE)
TIMER 2
INTERRUPT
XTAL1
:12
F
OSC
F
XTAL
0
1
T2CONreg
T2CONreg
T2CONreg
T2EX:
if DCEN=1, 1=UP
if DCEN=1, 0=DOWN
if DCEN = 0, up
Clock
OutFrequency
–
RCAP
2
H
4
65536
–
RCAP
2
L
(
)
×
-------------------------------------------------------------------------------------------
=
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參數(shù)描述
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