MAC7200 datasheet(555/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

477

Figure 26-13. Dynamically Setting a New Load Value

Four of the timers and the RTI support interrupts. The RTI is used for system wakeup only. The other

interrupts are general-purpose.

26.9.1.2

Debug Mode

In Debug Mode the timers will be frozen - this is intended to aid software development, allowing the

developer to halt the processor, investigate the current state of the system (e.g. the timer values) and then

continue the operation.

26.9.2

Interrupts

The interrupts generated by the PIT are listed in Figure 26-14. Refer to the MCU specification for related

vector addresses and priorities.

26.9.2.1

Real Time Interrupt

The PIT_RTI generates a real time interrupt when the selected interrupt time period elapses. The RTI

interrupt is disabled locally by setting the RTIE bit to zero. The real time interrupt flag (RTIF) is set to 1

when a timeout occurs, and is cleared to 0 by writing a 1 to the RTIF bit.

Since the RTI operates on the oscillator clock, it can be used for periodic wakeup from WAIT mode

providede the CRG’s PRE bit is set to 1 and the RTI interrupt is enabled. It can also be used to generate a

general purpose interrupt.

26.9.2.2

Timer Interrupts

The PIT can also generate timer interrupts on the first four timer channels, when the timer’s selected

interrupt period elapses. Timer interrupts are disabled locally by setting the TIE bits to zero. The timer

interrupt flags (TIF) are set to 1 when a timeout occurs on the associated timer, and are cleared to 0 by

Table 26-14. PIT Interrupt Vectors

Interrupt Source

Local Enable

Real time interrupt

RTIE

Timer Interrupts

TIE[4:1]

Timer Enabled

New Start

Value p2 set

Start Value = p1

Trigger

Event

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