DSP56309EVM Freescale Semiconductor, DSP56309EVM Datasheet - Page 208

• Manufacturer Part Number: DSP56309EVM
• Description: KIT EVALUATION FOR XC56309
• Manufacturer: Freescale Semiconductor
• Type: DSPr

Specifications of DSP56309EVM

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Description/function: Audio DSPs
• Product: Audio Modules
• For Use With/related Products: DSP56309
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Triple Timer Module
9.3.3 Pulse Width Modulation
In Mode 7, the timer generates periodic pulses of a preset width. When the counter equals the
value in the TCPR, the
counter are placed into the TCR. If the TCSR[TCIE] bit is set, a compare interrupt is generated.
The counter continues to increment on each timer clock.
If counter overflow occurs, the
interrupt is generated if the TCSR[TOIE] bit is set. If the TCSR[TRM] bit is set, the counter is
loaded with the TLR value on the next timer clock and the count resumes. If the TCSR[TRM] bit
is cleared, the counter continues to increment on each timer clock. This process repeats until the
timer is disabled.
When the TCSR[TE] bit is set and the counter starts, the
each subsequent toggle of the
the INV bit is set, the
TIO
The value of the TLR determines the output period ($FFFFFF − TLR + 1). The timer counter
increments the initial TLR value and toggles the
$FFFFFF. The duty cycle of the
value in the TLR increments to a value equal to the value in the TCPR, the
The duty cycle is equal to ($FFFFFF – TCPR) divided by ($FFFFFF − TLR + 1). For a 50 percent
duty cycle, the value of TCPR is equal to ($FFFFFF + TLR + 1)/2.
Note:
9-16
TC3
0
signal generates the following signal: 0101.
TC2
The value in TCPR must be greater than the value in TLR.
Bit Settings
1
TC1
1
TIO
TIO
TC0
signal generates the following signal: 1010. If the INV bit is cleared, the
1
output signal is toggled and TCSR[TCF] is set. The contents of the
TIO
TIO
TIO
Mode
signal, the polarity of the
7
output signal is toggled, TCSR[TOF] is set, and an overflow
DSP56309 User’s Manual, Rev. 1
signal is determined by the value in the TCPR. When the
Pulse width modulation
Name
TIO
signal when the counter value exceeds
Mode Characteristics
TIO
TIO
signal assumes the value of INV. On
signal is reversed. For example, if
Function
PWM
TIO
Freescale Semiconductor
Output
TIO
signal is toggled.
Internal
Clock