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T89C5115 Datasheet(PDF) 63 Page - ATMEL Corporation

No. de Pieza. T89C5115
Descripción  Low Pin Countl 8-bit Microcontroller with A/D Converter and 16 KBytes Flash Memory
Descarga  113 Pages
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Fabricante  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
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T89C5115 Datasheet(HTML) 63 Page - ATMEL Corporation

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63
AT89C5115
4128F–8051–05/06
Programmable Clock-
Output
In clock-out mode, Timer 2 operates as a 50%-duty-cycle, programmable clock genera-
tor (Figure 30). The input clock increments TL2 at frequency f
OSC/2 . Th e tim e r
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 30. Clock-Out Mode
Clock OutFrequency
FT2clock
4
65536
RCAP2H
RCAP2L
()
×
-----------------------------------------------------------------------------------------
=
EXEN2
EXF2
OVERFLOW
T2EX
TH2
(8-bit)
TL2
(8-bit)
TIMER 2
RCAP2H
(8-bit)
RCAP2L
(8-bit)
T2OE
T2CON reg
T2CON reg
T2MOD reg
INTERRUPT
TR2
T2CON.2
FT2
CLOCK
T2
Q
D
Toggle
Q


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