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T89C51RD2-DDFC-L View Datasheet(PDF) - Atmel Corporation

Part Name
Description
Manufacturer
T89C51RD2-DDFC-L
Atmel
Atmel Corporation Atmel
T89C51RD2-DDFC-L Datasheet PDF : 86 Pages
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T89C51RD2
XTAL1
FXTAL
FOSC
:12
0
1
T2
C/T2
TR2
T2CONreg T2CONreg
(DOWN COUNTING RELOAD VALUE)
FFh
(8-bit)
FFh
(8-bit)
TL2
(8-bit)
TH2
(8-bit)
T2EX:
if DCEN=1, 1=UP
if DCEN=1, 0=DOWN
if DCEN = 0, up counting
TOGGLE T2CONreg
EXF2
TF2
T2CONreg
TIMER 2
INTERRUPT
RCAP2L RCAP2H
(8-bit)
(8-bit)
(UP COUNTING RELOAD VALUE)
Figure 5. Auto-Reload Mode Up/Down Counter (DCEN = 1)
6.4.2. Programmable Clock-Output
In the clock-out mode, timer 2 operates as a 50%-duty-cycle, programmable clock generator (See Figure 6) . 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 :
Clock OutFrequency = 4-----×-----(--6---5---5---3---6-----–----R----C-F----oA---s-P--c--2---H---------R----C----A----P-----2---L----)
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.
18
Rev. F - 15 February, 2001
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