MAC7200 datasheet(541/976 Pages) FREESCALE

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PIT Implementation

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

463

•

Timer 0 will serve as a Real-Time Interrupt (RTI) that can be used to wakeup the system out of low

power modes. For this reason, it is run off of a separate clock.

•

Timers 1-4 may be used to generate general purpose periodic interrupts

•

Timers 1-8 may be used as DMA triggers

•

Timers 9-10 may be used as on-chip sample triggers for the ATD

26.2.1

Modes of Operation

This subsection describes briefly all operating modes supported by the PIT.

•

Run Mode

All functional parts of the PIT are running during normal Run Mode.

•

Doze Mode

The PIT’s RTI timer can run in Doze mode depending on the settings in the CRG (Clock and Reset

Generator Module).

26.3

PIT Implementation

The PIT on the MAC72xx is an enhanced version of the PIT on the MAC71xx family of devices.

26.4

PIT External Pins

There are no PIT signals that drive or are driven from MCU pins.

26.5

PIT Bus Aborts

The PIT module supports Peripheral Bus bus aborts, and enforces the following memory map:

Table 26-1. PIT Timer Usage

Timer

Interrupt

DMA trigger

(DMA channel)

ATD Trigger

0 (RTI)

X (#0)

X (#1)

X (#2)

X (#3)

5X (#4)

6X (#5)

7X (#6)

8X (#7)

X (SYSTRIG1)

X (SYSTRIG0)

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