參數(shù)資料
型號(hào)： TS80C32X2-LIA
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 30 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 5/55頁
文件大小： 596K
代理商： TS80C32X2-LIA
13
TS8xCx2X2
4184I–8051–02/08
Figure 4. 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 5) . The input clock increments TL2 at frequency FOSC/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
(FOSC/216) to 4 MHz (FOSC/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
C/T2
TF2
TR2
T2
EXF2
TH2
(8-bit)
TL2
(8-bit)
RCAP2H
(8-bit)
RCAP2L
(8-bit)
FFh
(8-bit)
FFh
(8-bit)
TOGGL
(UP COUNTING RELOAD VALUE)
TIMER 2
INTERRUPT
XTAL1
:12
FOSC
FXTAL
0
1
T2CONreg
T2EX:
if DCEN=1, 1=UP
if DCEN=1, 0=DOWN
if DCEN = 0, up counting
(:6 in X2 mode)
Clock
OutFrequency
–
F
osc
4
65536 RCAP2H
–
RCAP
2L
(
)
×
-----------------------------------------------------------------------------------------
=
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