Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 61)

Rev.A - May 17, 2001 61

Preliminary

T89C51CC02

13.4. Registers

T2CON (S:C8h)

Timer 2 Control Register

Reset Value = 0000 0000b

Bit addressable

Figure 47. T2CON Register

7 6 5 4 3 2 1 0

TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2# CP/RL2#

Bit Number Bit Mnemonic Description

7 TF2

Timer 2 overflow Flag

TF2 is not set if RCLK=1 or TCLK = 1.

Must be cleared by software.

Set by hardware on timer 2 overflow.

6 EXF2

Timer 2 External Flag

Set when a capture or a reload is caused by a negative transition on T2EX pin if EXEN2=1.

Set to cause the CPU to vector to timer 2 interrupt routine when timer 2 interrupt is enabled.

Must be cleared by software.

5 RCLK

Receive Clock bit

Clear to use timer 1 overflow as receive clock for serial port in mode 1 or 3.

Set to use timer 2 overflow as receive clock for serial port in mode 1 or 3.

4 TCLK

Transmit Clock bit

Clear to use timer 1 overflow as transmit clock for serial port in mode 1 or 3.

Set to use timer 2 overflow as transmit clock for serial port in mode 1 or 3.

3 EXEN2

Timer 2 External Enable bit

Clear to ignore events on T2EX pin for timer 2 operation.

Set to cause a capture or reload when a negative transition on T2EX pin is detected, if timer 2 is not used to

clock the serial port.

2 TR2

Timer 2 Run control bit

Clear to turn off timer 2.

Set to turn on timer 2.

1 C/T2#

Timer/Counter 2 select bit

Clear for timer operation (input from internal clock system: F

OSC

Set for counter operation (input from T2 input pin).

0 CP/RL2#

Timer 2 Capture/Reload bit

If RCLK=1 or TCLK=1, CP/RL2# is ignored and timer is forced to auto-reload on timer 2 overflow.

Clear to auto-reload on timer 2 overflows or negative transitions on T2EX pin if EXEN2=1.

Set to capture on negative transitions on T2EX pin if EXEN2=1.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 136 137

T89C51CC02 1

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