Public Version
General-Purpose Timers
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16.2.1.1 GP Timers Features
The following are the main features of the GP timers controllers:
•
L4 slave interface support:
–
32-bit data bus width
–
32-/16-bit access supported
–
8-bit access not supported
–
10-bit address bus width
–
Burst mode not supported
–
Write nonposted transaction mode supported
•
Interrupts generated on overflow, compare, and capture
•
Free-running 32-bit upward counter
•
Compare and capture modes
•
Autoreload mode
•
Start/stop mode
•
Programmable divider clock source (2
n
with n = [0:8])
•
Dedicated input trigger for capture mode and dedicated output trigger/PWM signal
•
Dedicated output signal for general-purpose using GPTi_GPOCFG signal
•
On-the-fly read/write register (while counting)
•
1-ms tick with 32,768 Hz functional clock generated (only GPTIMER1, GPTIMER2, and GPTIMER10)
16.2.2 GP Timers Environment
16.2.2.1 GP Timers External System Interface
Four of the 11 GP timers can send or receive stimulus to/from the external (off-chip) system. In the device,
however, only GPTIMER8 through GPTIMER11 are configured to output a PWM pulse or receive an
external event signal used as a trigger to capture the current timer count. GPTIMER1 is also configured to
receive an event trigger input (GPT1_EVENT_CAPTURE) tied to the internal 32-kHz clock. This event
signal gauges the system clock input; it detects its frequency among 12, 13, 16.8, 19.2, 26, or 38.4 MHz.
shows the external system interface for the GP timers, and
describes the GP timer
inputs and outputs.
NOTE:
Software must ensure that mux mode is configured to select the gpt_x_pwm_evt (where x =
8 to 11) signal on only one pad. Other pads on which the same signal is multiplexed must be
configured in safe mode or non-gptimer mode to avoid two different pads driving the same
signal.
For more information about the gpt_8_pwm_evt through gpt11_pwm_evt I/O pad
configuration, see
, System Control Module.
2704
Timers
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
