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MSM80C154S Datasheet

  • MSM80C154S

  • USER'S MANUAL

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隆 Semiconductor
Timer 2 control register (T2CON)
MSB
7
TF2
6
EXF2
5
RCLK
4
TCLK
3
EXEN2
MSM80C154S/83C154S
NAME
T2CON
BIT LOCATION
T2CON.0
ADDRESS
0C8H
FLAG
CP/RL2
LSB
2
TR2
1
C/T2
0
CP/RL2
FUNCTION
Capture mode is set when TCLK + RCLK = "0" and CP/RL2 = "1".
16-bit auto reload mode is set when TCLK + RCLK = "0" and CP/RL2 = "0".
CP/RL2 is ignored when TCLK + RCLK = "1".
Timer/counter 2 count clock designation control bit.
The internal clocks (XTAL1鈥? 梅 12, XTAL1鈥? 梅 2) are used when this bit is "0",
and the external clock applied to the T2 pin is passed to timer/counter 2 when
the bit is "1".
Timer/counter 2 counting start and stop control bit.
Timer/counter 2 commences counting when this bit is "1" and stops counting
when "0".
T2EX timer/counter 2 external control signal control bit.
Input of the T2EX signal is disabled when this bit is "0", and enabled when "1".
Serial port transmit circuit drive clock control bit.
Timer/counter 2 is switched to baud rate generator mode when this bit is "1",
and the timer/counter 2 carry signal becomes the serial port transmit clock.
Note, however, that the serial ports can only use the timer/counter 2 carry signal
in serial port modes 1 and 3.
Serial port receive circuit drive clock control bit.
Timer/counter 2 is switched to baud rate generator mode when this bit is "1",
and the timer/counter 2 carry signal becomes the serial port transmit clock.
Note, however, that the serial ports can only use the timer/counter 2 carry signal
in serial port modes 1 and 3.
Timer/counter 2 external flag.
This bit is set to "1" when the T2EX timer/counter 2 external control signal level
is changed from "1" to "0" while EXEN2 = "1".
This flag serves as the timer interrupt 2 request signal. If an interrupt is
generated, EXF2 must be reset to "0" by software.
Timer/counter 2 carry flag.
This bit is set to "1" by a carry signal when timer/counter 2 is in 16-bit auto
reload mode or in capture mode.
This flag serves as the timer interrupt 2 request signal. If an interrupt is
generated, TF2 must be reset to "0" by software.
T2CON.1
C/T2
T2CON.2
TR2
T2CON.3
T2CON.4
EXEN2
TCLK
T2CON.5
RCLK
T2CON.6
EXF2
T2CON.7
TF2
19/40

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