Rainbow-electronics T89C5115 Manual de usuario descargar pdf (Pagina 59)

T89C5115

4128A–8051–04/02

Registers Table 37. T2CON Register

T2CON (S:C8h)

Timer 2 Control Register

Reset Value = 0000 0000b

Bit addressable

76543210

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

Bit

Number

Bit

Mnemonic Description

7TF2

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.

6EXF2

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.

5RCLK

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.

4TCLK

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.

SettocauseacaptureorreloadwhenanegativetransitiononT2EXpinis

detected, if Timer 2 is not used to clock the serial port.

2TR2

Timer 2 Run control bit

Clear to turn off Timer 2.

SettoturnonTimer2.

1C/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).

0CP/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 ... 54 55 56 57 58 59 60 61 62 63 64 ... 104 105

T89C5115 1
4128A–8051–04/02 /xM 105

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Rainbow-electronics T89C5115 Manual de usuario Pagina 59

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