DSP56321 datasheet(19/84 Pages) FREESCALE

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Timers

DSP56321 Technical Data, Rev. 11

Freescale Semiconductor

1-13

1.10 Timers

The DSP56321 has three identical and independent timers. Each timer can use internal or external clocking and can

either interrupt the DSP56321 after a specified number of events (clocks) or signal an external device after

counting a specific number of internal events.

SCLK

PE2

Input/Output

Input or Output

Ignored Input

Serial Clock—Provides the input or output clock used by the transmitter and/or

the receiver.

Port E 2—The default configuration following reset is GPIO input PE2. When

configured as PE2, signal direction is controlled through the Port E Direction

E Control Register.

Notes:

In the Stop state, the signal maintains the last state as follows:

• If the last state is input, the signal is an ignored input.

• If the last state is output, these lines have weak keepers that maintain the last output state even if the drivers are tri-stated.

The Wait processing state does not affect the signal state.

Table 1-14.

Triple Timer Signals

Signal Name

Type

State During

Reset1,2

Signal Description

TIO0

Input or Output

Ignored Input

Timer 0 Schmitt-Trigger Input/Output— When Timer 0 functions as an

external event counter or in measurement mode, TIO0 is used as input. When

Timer 0 functions in watchdog, timer, or pulse modulation mode, TIO0 is used

as output.

The default mode after reset is GPIO input. TIO0 can be changed to output or

configured as a timer I/O through the Timer 0 Control/Status Register (TCSR0).

TIO1

Input or Output

Ignored Input

Timer 1 Schmitt-Trigger Input/Output— When Timer 1 functions as an

external event counter or in measurement mode, TIO1 is used as input. When

Timer 1 functions in watchdog, timer, or pulse modulation mode, TIO1 is used

as output.

The default mode after reset is GPIO input. TIO1 can be changed to output or

configured as a timer I/O through the Timer 1 Control/Status Register (TCSR1).

TIO2

Input or Output

Ignored Input

Timer 2 Schmitt-Trigger Input/Output— When Timer 2 functions as an

external event counter or in measurement mode, TIO2 is used as input. When

Timer 2 functions in watchdog, timer, or pulse modulation mode, TIO2 is used

as output.

The default mode after reset is GPIO input. TIO2 can be changed to output or

configured as a timer I/O through the Timer 2 Control/Status Register (TCSR2).

Notes:

In the Stop state, the signal maintains the last state as follows:

• If the last state is input, the signal is an ignored input.

• If the last state is output, these lines have weak keepers that maintain the last output state even if the drivers are tri-stated.

The Wait processing state does not affect the signal state.

Table 1-13.

Serial Communication Interface (Continued)

Signal Name

Type

State During

Reset1,2

Signal Description

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