ST92F124 datasheet(197/429 Pages) STMICROELECTRONICS

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MULTIFUNCTION TIMER (MFT)

MULTIFUNCTION TIMER (Cont’d)

10.4.4 Output Pin Assignment

Two external outputs are available when pro-

grammed as Alternate Function Outputs of the I/O

pins.

Two registers Output A Control Register (OACR)

and Output B Control Register (OBCR) define the

driver for the outputs and the actions to be per-

formed.

Each of the two output pins can be driven from any

of the three possible sources:

– Compare Register 0 event logic

– Compare Register 1 event logic

– Overflow/Underflow event logic.

Each of these three sources can cause one of the

following four actions on any of the two outputs:

– Nop

– Set

– Reset

– Toggle

Furthermore an On Chip Event signal can be driv-

en by two of the three sources: the Over/Under-

flow event and Compare 0 event by programming

the CEV bit of the OACR register and the OEV bit

of OBCR register respectively. This signal can be

used internally to synchronise another on-chip pe-

ripheral.

Output Waveforms

Depending on the programming of OACR and OB-

CR, the following example waveforms can be gen-

erated on TxOUTA and TxOUTB pins.

For a configuration where TxOUTA is driven by the

Over/Underflow (OUF) and the Compare 0 event

(CM0), and TxOUTB is driven by the Over/Under-

flow and Compare 1 event (CM1):

OACR is programmed with TxOUTA preset to “0”,

OUF sets TxOUTA, CM0 resets TxOUTA and

CM1 does not affect the output.

OBCR is programmed with TxOUTB preset to “0”,

OUF sets TxOUTB, CM1 resets TxOUTB while

CM0 does not affect the output.

For a configuration where TxOUTA is driven by the

Over/Underflow, by Compare 0 and by Compare

1; TxOUTB is driven by both Compare 0 and Com-

pare 1. OACR is programmed with TxOUTA pre-

set to “0”. OUF toggles Output 0, as do CM0 and

CM1. OBCR is programmed with TxOUTB preset

to “1”. OUF does not affect the output; CM0 resets

TxOUTB and CM1 sets it.

OACR = [101100X0]

OBCR = [111000X0]

T0OUTA

T0OUTB

OUF

COMP1

OUF

COMP1

OUF COMP0 OUF COMP0

OACR = [010101X0]

OBCR = [100011X1]

T0OUTA

T0OUTB

COMP1 COMP1

OUF

COMP0

COMP1 COMP1

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