C511 datasheet(56/128 Pages) SIEMENS

56 / 128 page

On-Chip Peripheral Units

Semiconductor Group

6-23

Special Function Register T2CON (Address C8H)

Reset Value : 00H

Bit

Function

TF2

Timer 2 Overflow Flag.

Set by a timer 2 overflow. Must be cleared by software. TF2 will not be set when

either RCLK = 1 or TCLK = 1.

EXF2

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. EXF2

does not cause an interrupt in up/down counter mode (DCEN = 1, SFR T2MOD)

RCLK

Receive Clock Enable.

When set, causes the serial port to use timer 2 overflow pulses for its receive

clock in serial port modes 1 and 3. RCLK = 0 causes timer 1 overflows to be used

for the receive clock.

TCLK

Transmit Clock Enable.

When set, causes the serial port to use timer 2 overflow pulses for its transmit

clock in serial port modes 1 and 3. TCLK = 0 causes timer 1 overflow to be used

for the transmit clock.

EXEN2

Timer 2 External Enable.

When set, allows a capture or reload to occur as a result of a negative transition

on pin T2EX (P1.1) if timer 2 is not being used to clock the serial port. EXEN2 = 0

causes timer 2 to ignore events at T2EX.

TR2

Start / Stop Control for Timer 2.

TR2 = 1 starts timer 2.

C/T2

Timer or Counter Select for Timer 2.

C/T2 = 0 for timer function. C/T2 = 1 for external event counter (falling edge

triggered).

CP/RL2

Capture / Reload Select.

CP/RL2 = 1 causes captures to occur an negative transitions at pin T2EX if

EXEN2 = 1. CP/RL2 = 0 causes automatic reloads to occur when timer 2

overflows or negative transitions occur at pin 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.

TF2

EXF2

RCLK

TCLK

C8H

T2CON

Bit No.

MSB

LSB

EXEN2

TR2

C/T2

CP/RL2

C511 Datasheet(PDF) 56 Page - Siemens Semiconductor Group

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