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80C52T-44D Datasheet(PDF) 8 Page - TEMIC Semiconductors

Part # 80C52T-44D
Description  CMOS 0 to 44 MHz Single-chip 8 Bit Microcontroller
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Manufacturer  TEMIC [TEMIC Semiconductors]
Direct Link  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

80C52T-44D Datasheet(HTML) 8 Page - TEMIC Semiconductors

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80C32/80C52
MATRA MHS
Rev. E (31/08/95)
8
The capture mode is illustrated in Figure 7.
Figure 7. Timer 2 in Capture Mode.
In the auto-reload mode there are again two options,
which are selected by bit EXEN2 in T2CON.If
EXEN2 = 0, then when Timer 2 rolls over it does not only
set TF2 but also causes the Timer 2 register to be reloaded
with the 16 bit value in registers RCAP2L and RCAP2H,
which are preset by software. If EXEN2 = 1, then Timer
2 still does the above, but with the added feature that a
1-to-0 transition at external input T2EX will also trigger
the 16 bit reload and set EXF2.
The auto-reload mode is illustrated in Figure 8.
Figure 8. Timer in Auto-Reload Mode.
(MSB)
(LSB)
TF2
EXF2
RCLK
TCLK
EXEN2
TR2
C/T2
CP/RL2
The baud rate generator mode is selected by : RCLK = 1 and/or TCLK = 1.
Symbol
Position
Name and Significance
TF2
T2CON.7
Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2
will not be set when either RCLK = 1 OR TCLK = 1.
EXF2
T2CON.6
Timer 2 external flag set when either a capture or reload is caused by a negative
transition on T2EX and EXEN2 = 1. When Timer 2 interrupt is enabled, EXF2 = 1 will
cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must be cleared by
software.
RCLK
T2CON.5
Receive clock flag. When set, causes the serial port to use Timer2 overflow pulses for its
receive clock in modes 1 and 3. RCLK = 0 causes Timer 1 overflow to be used for the
receive clock.
TCLK
T2CON.4
Transmit clock flag. When set, causes the serial port to use Timer 2 overflow pulses for
its transmit clock in modes 1 and 3. TCLK = 0 causes Timer 1 overflows to be used for
the transmit clock.
EXEN2
T2CON.3
Timer 2 external enable flag. When set, allows capture or reload to occur as a result of a
negative transition on T2EX if Timer 2 is not being used to clock the serial port.
EXEN2 = 0 causes Timer 2 to ignore events at T2EX.
TR2
T2CON.2
Start/stop control for Timer 2. A logic 1 starts the timer.
C/T2
T2CON.1
Timer or counter select. (Timer 2) 0 = Internal timer (OSC/12)
1 = External event counter (falling edge triggered).
CP/RL2
T2CON.0
Capture/Reload flag. When set, captures will occur on negative transitions at T2EX if
EXEN 2 = 1. When cleared, auto reloads will occur either with Timer 2 overflows or
negative transition at T2EX when EXEN2 = 1. When either RCLK = 1 or TCLK = 1, this
bit is ignored and the timer is forced to auto-reload on Timer 2 overflow.


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