ST90135 datasheet(109/190 Pages) STMICROELECTRONICS

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ST90158 - MULTIFUNCTION TIMER (MFT)

MULTIFUNCTION TIMER (Cont’d)

9.2.3.1 TxINA = I/O - TxINB = I/O

Input pins A and B are not used by the Timer. The

counter clock is internally generated and the up/

down selection may be made only by software via

the UDC (Software Up/Down) bit in the TCR regis-

ter.

9.2.3.2 TxINA = I/O - TxINB = Trigger

The signal applied to input pin B acts as a trigger

signal on REG1R register. The prescaler clock is

internally generated and the up/down selection

may be made only by software via the UDC (Soft-

ware Up/Down) bit in the TCR register.

9.2.3.3 TxINA = Gate - TxINB = I/O

The signal applied to input pin A acts as a gate sig-

nal for the internal clock (i.e. the counter runs only

when the gate signal is at a low level). The counter

clock is internally generated and the up/down con-

trol may be made only by software via the UDC

(Software Up/Down) bit in the TCR register.

9.2.3.4 TxINA = Gate - TxINB = Trigger

Both input pins A and B are connected to the timer,

with the resulting effect of combining the actions

relating to the previously described configurations.

9.2.3.5 TxINA = I/O - TxINB = Ext. Clock

The signal applied to input pin B is used as the ex-

ternal clock for the prescaler. The up/down selec-

tion may be made only by software via the UDC

(Software Up/Down) bit in the TCR register.

9.2.3.6 TxINA = Trigger - TxINB = I/O

The signal applied to input pin A acts as a trigger

for REG0R, initiating the action for which the reg-

ister was programmed (i.e. a reload or capture).

The prescaler clock is internally generated and the

up/down selection may be made only by software

via the UDC (Software Up/Down) bit in the TCR

(*) The timer is in One shot mode and REGOR in

Reload mode

9.2.3.7 TxINA = Gate - TxINB = Ext. Clock

The signal applied to input pin B, gated by the sig-

nal applied to input pin A, acts as external clock for

the prescaler. The up/down control may be made

only by software action through the UDC bit in the

TCR register.

9.2.3.8 TxINA = Trigger - TxINB = Trigger

The signal applied to input pin A (or B) acts as trig-

ger signal for REG0R (or REG1R), initiating the

action for which the register has been pro-

grammed. The counter clock is internally generat-

ed and the up/down selection may be made only

by software via the UDC (Software Up/Down) bit in

the TCR register.

ST90135 Datasheet(PDF) 109 Page - STMicroelectronics

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