ST92F120JR9T datasheet(179/320 Pages) STMICROELECTRONICS

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MULTIFUNCTION TIMER (MFT)

MULTIFUNCTION TIMER (Cont’d)

OUTPUT B CONTROL REGISTER (OBCR)

R253 - Read/Write

Reset value: 0000 0000 (00h)

Note: Whenever more than one event occurs si-

multaneously, the action taken will be the result of

ANDing the event bits xxE1-xxE0.

Bit 7:6 = C0E[0:1]:

COMP0 event bits.

These bits are set and cleared by software.

Bit 5:4 = C1E[0:1]:

COMP1 event bits.

These bits are set and cleared by software.

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

OVF/UNF event bits.

These bits are set and cleared by software.

Bit 1 = OEV:

On-Chip event on OVF/UNF.

This bit is set and cleared by software.

0: No action

1: An underflow/overflow activates the on-chip

event signal (a single pulse is generated)

Bit 0 = OP:

TxOUTB preset value.

This bit is set and cleared by software and by hard-

ware. The value of this bit is the preset value of the

TxOUTB pin. Reading this bit returns the current

state of the TxOUTB pin (useful when it is selected

in toggle mode).

C0E0 C0E1 C1E0 C1E1 OUE0 OUE1 OEV 0P

C0E0

C0E1

Action on TxOUTB pin on

a suc-

cessful compare of the CMP0R

Set

Toggle

Reset

NOP

C1E0

C1E1

Action on TxOUTB pin on a suc-

cessful compare of the CMP1R reg-

ister

Set

Toggle

Reset

NOP

OUE0

OUE1

Action on TxOUTB pin on an Over-

flow or Underflow on the U/D coun-

ter

Set

Toggle

Reset

NOP

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