參數(shù)資料
型號(hào): T89C51RD2-RDSI-M
廠商: Atmel Corp.
英文描述: 0 to 40MHz Flash Programmable 8-bit Microcontroller
中文描述: 0至40MHz可編程閃存8位微控制器
文件頁數(shù): 71/170頁
文件大?。?/td> 1927K
代理商: T89C51RD2-RDSI-M
71
A/T89C51CC01
4129L–CAN–08/05
Programmable Clock-
Output
In clock-out mode, timer 2 operates as a 50%-duty-cycle, programmable clock genera-
tor (See Figure 37). 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 depending on the
system oscillator frequency and the value in the RCAP2H and RCAP2L registers:
For a 16 MHz system clock in x1 mode, 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 different 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.
Figure 37.
Clock-Out Mode
Clock
OutFrequency
2
clock
RCAP
2
H
4
65536
RCAP
2
L
(
)
×
------------------------------FT
=
EXEN2
T2CON reg
EXF2
OVERFLOW
T2EX
TH2
(8-bit)
TL2
(8-bit)
TIMER 2
INTERRUPT
RCAP2H
(8-bit)
RCAP2L
(8-bit)
T2OE
T2MOD reg
T2CON reg
TR2
T2CON.2
FT2
CLOCK
T2
Q
D
Toggle
Q
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