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Operating Modes
9.3 Operating Modes
Each timer has operating modes that meet a variety of system requirements, as follows:
Timer
— GPIO, mode 0: Internal timer interrupt generated by the internal clock
— Pulse, mode 1: External timer pulse generated by the internal clock
— Toggle, mode 2: Output timing signal toggled by the internal clock
— Event counter, mode 3: Internal timer interrupt generated by an external clock
Measurement
— Input width, mode 4: Input pulse width measurement
— Input period, mode 5: Input signal period measurement
— Capture, mode 6: Capture external signal
PWM, mode 7: Pulse width modulation
Watchdog
— Pulse, mode 9: Output pulse, internal clock
— Toggle, mode 10: Output toggle, internal clock
Note:
To ensure proper operation, the TCSR TC[3–0] bits should be changed only when the
timer is disabled (that is, when TCSR[TE] is cleared).
9.3.1 Triple Timer Modes
For all triple timer modes, the following points are true:
The TCSR[TE] bit is set to clear the counter and enable the timer. Clearing TCSR[TE]
disables the timer.
The value to which the timer is to count is loaded into the TCPR. (This is true for all
modes except the measurement modes (modes 4 through 6).
The counter is loaded with the TLR value on the first clock.
If the counter overflows, TCSR[TOF] is set, and if TCSR[TOIE] is set, an overflow
interrupt is generated.
You can read the counter contents at any time from the Timer Count Register (TCR).
9.3.1.1 Timer GPIO (Mode 0)
Bit Settings
Mode Characteristics
TC3
0
TC2
0
TC1
0
TC0
0
Mode
0
Name
GPIO
Function
Timer
TIO
GPIO
Clock
Internal
In Mode 0, the timer generates an internal interrupt when a counter value is reached, if the timer
compare interrupt is enabled (see Figure 9-3 and Figure 9-4 ). When the counter equals the
TCPR value, TCSR[TCF] is set and a compare interrupt is generated if the TCSR[TCIE] bit is
DSP56311 User’s Manual, Rev. 2
Freescale Semiconductor
9-5
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