ST72321R7-Auto datasheet(112/243 Pages) STMICROELECTRONICS

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16-bit timer

ST72321xx-Auto

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Doc ID 13829 Rev 1

13.4

Low power modes

13.5

Interrupts

Note:

The 16-bit timer interrupt events are connected to the same interrupt vector (see Chapter 7:

Interrupts on page 49). 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).

13.6

Summary of timer modes

Table 56.

Effect of low power modes on 16-bit timer

Mode

Effect

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 ICAPi pin, the input capture detection circuitry is

armed. Consequently, when the MCU is woken up by an interrupt with “exit from Halt

mode” capability, the ICFi bit is set, and the counter value present when exiting from Halt

mode is captured into the ICiR register.

Table 57.

16-bit timer interrupt control/wake-up capability

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

Output Compare 1 event (not available in PWM mode)

OCF1

OCIE

Output Compare 2 event (not available in PWM mode)

OCF2

Timer Overflow event

TOF

TOIE

Table 58.

Timer modes

Modes

Timer resources

Input

Capture 1

Input

Capture 2

Output

Compare 1

Output

Compare 2

Input Capture

(1 and/or 2)

Yes

Output Compare

(1 and/or 2)

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