TS80C32X2-LCAR TEMIC [TEMIC Semiconductors], TS80C32X2-LCAR Datasheet - Page 14
TS80C32X2-LCAR
Manufacturer Part Number
TS80C32X2-LCAR
Description
8-bit CMOS Microcontroller 0-60 MHz
Manufacturer
TEMIC [TEMIC Semiconductors]
Datasheet
1.TS80C32X2-LCAR.pdf
(54 pages)
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TS80C52X2
6.3.2 Programmable Clock-Output
In the clock-out mode, timer 2 operates as a 50%-duty-cycle, programmable clock generator (See Figure 5) . The
input clock increments TL2 at frequency F
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
(F
Timer 2 is programmed for the clock-out mode as follows:
14
OSC
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.
/2
16)
to 4 MHz (F
XTAL1
Clock OutFrequency
F
OSC
Figure 4. Auto-Reload Mode Up/Down Counter (DCEN = 1)
XTAL
/4). The generated clock signal is brought out to T2 pin (P1.0).
–
OSC
Preliminary
F
OSC
/2. The timer repeatedly counts to overflow from a loaded value.
=
--------------------------------------------------------------------------------------
4
(UP COUNTING RELOAD VALUE)
(DOWN COUNTING RELOAD VALUE)
65536 RCAP2H
T2
:
12
RCAP2L
(8-bit)
(8-bit)
(8-bit)
TL2
FFh
–
F
osc
T2CONreg
RCAP2H
C/T2
(8-bit)
(8-bit)
TH2
(8-bit)
0
FFh
1
RCAP2L
T2CONreg
TR2
T2EX:
if DCEN=1, 1=UP
if DCEN=1, 0=DOWN
if DCEN = 0, up counting
TOGGLE
T2CONreg
Rev. B - Jan. 25, 1999
TF2
T2CONreg
EXF2
INTERRUPT
TIMER 2
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