ST92F124 datasheet(207/429 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)

Bits 7:6 = C0E[0:1]: COMP0 Action Bits.

These bits are set and cleared by software. They

configure the type of action to be performed on the

TxOUTB output pin when successful compare of

the CMP0R register occurs. Refer to Table 43 for

the list of actions that can be configured.

Bits 5:4 = C0E[0:1]: COMP1 Action Bits.

These bits are set and cleared by software. They

configure the type of action to be performed on the

TxOUTB output pin when a successful compare of

the CMP1R register occurs. Refer to Table 43 for

the list of actions that can be configured.

Bits 3:2 = OUE[0:1]: OVF/UNF Action Bits.

These bits are set and cleared by software.They

configure the type of action to be performed on the

TxOUTB output pin when an Overflow or Under-

flow on the U/D counter occurs. Refer to Table 43

for the list of actions that can be configured.

Table 43. Output B Action Bits

Notes:

– xx stands for C0, C1 or OU.

– Whenever more than one event occurs simulta-

neously, Action Bit 0 will be the result of ANDing

Action Bit 0 of all simultaneous events and Action

Bit 1 will be the result of ANDing Action Bit 1 of

all simultaneous events.

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

xxE0

xxE1

Action on the TxOUTB pin when an

xx event occurs

Set

Toggle

Reset

NOP

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