ST72324 datasheet(71/161 Pages) STMICROELECTRONICS

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ST72324

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16-BIT TIMER (Cont’d)

10.3.4 Low Power Modes

10.3.5 Interrupts

Note: The 16-bit Timer interrupt events are connected to the same interrupt vector (see Interrupts chap-

ter). These events generate an interrupt if the corresponding Enable Control Bit is set and the interrupt

mask in the CC register is reset (RIM instruction).

* The ICF2 and OCF2 bits are forced by hardware to 0 in Timer A, hence there is no interrupt event for

these flags.

10.3.6 Summary of Timer modes

1) See note 4 in Section 10.3.3.5 One Pulse Mode

2) See note 5 and 6 in Section 10.3.3.5 One Pulse Mode

3) See note 4 in Section 10.3.3.6 Pulse Width Modulation Mode

4) The TAOC2HR, TAOC2LR registers are write only in Timer A. Output Compare 2 event cannot be gen-

erated, OCF2 is forced by hardware to 0.

5) Input Capture 2 is not implemented in Timer A. ICF2 bit is forced by hardware to 0.

Mode

Description

WAIT

No effect on 16-bit Timer.

Timer interrupts cause the device to exit from WAIT mode.

HALT

16-bit Timer registers are frozen.

In HALT mode, the counter stops counting until Halt mode is exited. Counting resumes from the previous

count when the MCU is woken up by an interrupt with “exit from HALT mode” capability or from the counter

reset value when the MCU is woken up by a RESET.

If an input capture event occurs on the ICAP

i pin, the input capture detection circuitry is armed. Consequent-

ly, when the MCU is woken up by an interrupt with “exit from HALT mode” capability, the ICF

i bit is set, and

the counter value present when exiting from HALT mode is captured into the IC

iR register.

Interrupt Event

Event

Flag

Enable

Control

Bit

Exit

from

Wait

Exit

from

Halt

Input Capture 1 event/Counter reset in PWM mode

ICF1

ICIE

Yes

Input Capture 2 event

ICF2

Yes

Output Compare 1 event (not available in PWM mode)

OCF1

OCIE

Yes

Output Compare 2 event (not available in PWM mode)

OCF2

Yes

Timer Overflow event

TOF

TOIE

Yes

MODES

TIMER RESOURCES

Input Capture 1

Input Capture 2

Output Compare 1 Output Compare 2

Input Capture (1 and/or 2)

Yes

Yes2)5)

Yes

Yes4)

Output Compare (1 and/or 2)

Yes

Yes5)

Yes

Yes4)

One Pulse Mode

Not

Recommended1)5)

Partially 2)

PWM Mode

Not

Recommended3)5)

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