DSP56303 FREESCALE [Freescale Semiconductor, Inc], DSP56303 Datasheet - Page 41

• Manufacturer Part Number: DSP56303
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

2.11 Timers
The DSP56303 has three identical and independent timers. Each can use internal or external
clocking, interrupt the DSP56303 after a specified number of events (clocks), or signal an
external device after counting a specific number of internal events.
Freescale Semiconductor
TIO0
RXD
PE0
TXD
PE1
SCLK
PE2
Notes: 1.
Signal
Signal
Name
Name
Input or
Output
Input
Input or
Output
Output
Input or
Output
Input/Output
Input or
Output
The Wait processing state does not affect the signal state.
Type
Type
Input
Input
Input
Input
Reset
Table 2-14. Serial Communication Interface (SCI)
Reset
State During
State During
Disconnected
Disconnected
Disconnected
Disconnected
Table 2-15. Triple Timer Signals
internally
internally
internally
internally
Stop
Stop
DSP56303 User’s Manual, Rev. 2
1
1
Serial Receive Data
Receives byte-oriented serial data and transfers it to the SCI
receive shift register.
Port E 0
The default configuration following reset is GPIO. When configured
as PE0, signal direction is controlled through the Port E Directions
Register (PRRE). This signal is configured as RXD or PE0 through
the Port E Control Register (PCRE). This input is 5 V tolerant.
Serial Transmit Data
Transmits data from SCI transmit data register.
Port E 1
The default configuration following reset is GPIO. When configured
as PE1, signal direction is controlled through the SCI PRRE. This
signal is configured as TXD or PE1 through PCRE. This input is 5 V
tolerant.
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. For PE2, signal
direction is controlled through the SCI PRRE. This signal is
configured as SCLK or PE2 through PCRE. This input is 5 V
tolerant.
Timer 0 Schmitt-Trigger Input/Output
As an external event counter or in Measurement mode, TIO0 is
input. In Watchdog, Timer, or Pulse Modulation mode, TIO0 is
output. The default mode after reset is GPIO input. This can be
changed to output or configured as a Timer Input/Output through
the Timer 0 Control/Status Register (TCSR0). This input is 5 V
tolerant.
Signal Description
Signal Description
Timers
2-17