DSP56300 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

DSP56300

24-Bit Digital Signal Processor

Freescale Semiconductor 

1.11 Timers

Timers

The DSP56309 has three identical and independent timers. Each timer can use internal or external clocking and can

either interrupt the DSP56309 after a specified number of events (clocks) or signal an external device after

counting a specific number of internal events.

Table 1-15. Triple Timer Signals

Signal Name

Type

TIO0

Input or Output

State During

Reset1,2

Signal Description

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.

TIO1

Input or Output Ignored Input

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).

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.

TIO2

Input or Output Ignored Input

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).

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: 1. 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, the signal is tri-stated.

2. The Wait processing state does not affect the signal state.

3. All inputs are 5 V tolerant.

Freescale Semiconductor

DSP56309 Technical Data, Rev. 7

1-15

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