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| 型号： | T83C5101ZZZ-3ZSIL |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDIP24 |
| 封装： | DIP-24 |
| 文件页数： | 8/52页 |
| 文件大小： | 701K |
| 代理商： | T83C5101ZZZ-3ZSIL |
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16
Rev. F - 12 March, 2001
T87C5101
T83C5101/02
Figure 5. Auto-Reload Mode Up/Down Counter (DCEN = 1)
7.4.2. 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 :
For a 16 MHz system clock, timer 2 has a programmable frequency range of 61 Hz
(FOSC/2
16) to 4 MHz (F
OSC/4) in X1 mode. 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
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
2x2
×
4
65536
RCAP2H
–
RCAP2L
()
×
--------------------------------------------------------------------------------------
=
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