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