ST92F120JR9T datasheet(177/320 Pages) STMICROELECTRONICS

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MULTIFUNCTION TIMER (MFT)

MULTIFUNCTION TIMER (Cont’d)

EXTERNAL

INPUT

CONTROL

(T_ICR)

R250 - Read/Write

Reset value: 0000 0000 (00h)

Bit 7:4 = IN[3:0]:

Input pin function.

These bits are set and cleared by software.

Bit 3:2 = A[0:1]:

TxINA Pin event.

These bits are set and cleared by software.

Bit 1:0 = B[0:1]:

TxINB Pin event.

These bits are set and cleared by software.

PRESCALER REGISTER (PRSR)

R251 - Read/Write

Reset value: 0000 0000 (00h)

This register holds the preset value for the 8-bit

prescaler. The PRSR content may be modified at

any time, but it will be loaded into the prescaler at

the following prescaler underflow, or as a conse-

quence of a counter reload (either by software or

upon external request).

Following a RESET condition, the prescaler is au-

tomatically loaded with 00h, so that the prescaler

divides by 1 and the maximum counter clock is

generated (OSCIN frequency divided by 6 when

MODER.5 = DIV2 bit is set).

The binary value programmed in the PRSR regis-

ter is equal to the divider value minus one. For ex-

ample, loading PRSR with 24 causes the prescal-

er to divide by 25.

IN3

IN2

IN1

IN0

IN[3:0] bits

TxINA

Pin Function

TxINB Input

Pin Function

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

not used

Gate

not used

Trigger

Gate

Trigger

Clock Up

Up/Down

Trigger Up

Up/Down

Autodiscr.

Trigger

Ext. Clock

Trigger

not used

Trigger

not used

Trigger

Ext. Clock

not used

Ext. Clock

Trigger

Clock Down

Ext. Clock

Trigger Down

not used

Autodiscr.

Ext. Clock

Trigger

Gate

TxINA Pin Event

No operation

Falling edge sensitive

Rising edge sensitive

Rising and falling edges

TxINB Pin Event

No operation

Falling edge sensitive

Rising edge sensitive

Rising and falling edges

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