ST92F124 datasheet(186/429 Pages) STMICROELECTRONICS

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EXTENDED FUNCTION TIMER (EFT)

EXTENDED FUNCTION TIMER (Cont’d)

STATUS REGISTER (SR)

R254 - Read Only

Reset Value: 0000 0000 (00h)

The three least significant bits are not used.

Bit 7 = ICF1 Input Capture Flag 1.

0: No input capture (reset value).

1: An input capture has occurred. To clear this bit,

first read the SR register, then read or write the

low byte of the IC1R (IC1LR) register.

Bit 6 = OCF1 Output Compare Flag 1.

0: No match (reset value).

1: The content of the free running counter has

matched the content of the OC1R register. To

clear this bit, first read the SR register, then read

or write the low byte of the OC1R (OC1LR) reg-

ister.

Bit 5 = TOF Timer Overflow.

0: No timer overflow (reset value).

1: The free running counter rolled over from FFFFh

to 0000h. To clear this bit, first read the SR reg-

ister, then read or write the low byte of the CR

(CLR) register.

Note: Reading or writing the ACLR register does

not clear TOF.

Bit 4 = ICF2 Input Capture Flag 2.

0: No input capture (reset value).

1: An input capture has occurred. To clear this bit,

first read the SR register, then read or write the

low byte of the IC2R (IC2LR) register.

Bit 3 = OCF2 Output Compare Flag 2.

0: No match (reset value).

1: The content of the free running counter has

matched the content of the OC2R register. To

clear this bit, first read the SR register, then read

or write the low byte of the OC2R (OC2LR) reg-

ister.

Bit 2:0 = Reserved, forced by hardware to 0.

CONTROL REGISTER 3 (CR3)

R255 - Read/Write

Reset Value: 0000 0000 (00h)

Bit 7 = IC1IE Input Capture1 interrupt enable

This bit is not significant if the ICIE bit in the CR1

0: ICAP1 interrupt disabled

1: ICAP1 interrupt enabled

Bit 6 = OC1IE output compare 1 interrupt enable

This bit is not significant if the OCIE bit in the CR1

0: OCMP1 interrupt disabled

1: OCMP1 interrupt enabled

Bit 5 = IC2IE input capture 2 interrupt enable

This bit is not significant if the ICIE bit in the CR1

0: ICAP2 interrupt disabled

1: ICAP2 interrupt enabled

Bit 4= OC2IE output compare 2 interrupt enable

This bit is not significant if the OCIE bit in the CR1

0: OCMP2 interrupt disabled

1: OCMP2 interrupt enabled

Bits 3:1 = Reserved, must be kept cleared.

Bit 0 = EFTIS Global Timer Interrupt Selection.

0: Select External interrupt.

1: Select Global Timer Interrupt.

ICF1

OCF1

TOF

ICF2

OCF2

IC1IE OC1IE IC2IE OC2IE

EFTIS

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