9-18
DSP56309UM/D MOTOROLA
Triple Timer Module
Timer Operational Modes
is reloaded with the TLR value at the next timer clock and the count is resumed. If the
TRM bit is cleared, the counter continues to be incremented on each timer clock signal.
This process is repeated until the timer is disabled (i.e., TE is cleared).
If the counter overflows, the TOF bit is set, and if TOIE is set, an overflow interrupt is
generated.
The counter contents can be read at any time by reading the TCR.
9.4.1.2
Timer Pulse (Mode 1)
In this mode, the timer generates an external pulse on its TIO signal when the timer
count reaches a pre-set value.
Set the TE bit to clear the counter and enable the timer. The value to which the timer is to
count is loaded into the TCPR. The counter is loaded with the TLR value when the first
timer clock signal is received. The TIO signal is loaded with the value of the INV bit. The
timer clock signal can be taken from either the DSP56309 clock divided by two (CLK/2)
or from the prescaler clock output. Each subsequent clock signal increments the counter.
When the counter matches the TCPR value, the TCF bit in TCSR is set and a compare
interrupt is generated if the TCIE bit is set. The polarity of the TIO signal is inverted for
one timer clock period.
If the TRM bit is set, the counter is loaded with the TLR value on the next timer clock and
the count is resumed. If the TRM bit is cleared, the counter continues to be incremented
on each timer clock.
This process is repeated until the TE bit is cleared (disabling the timer). The counter
contents can be read at any time by reading TCR.
The value of the TLR sets the delay between starting the timer and the generation of the
output pulse. To generate successive output pulses with a delay of X clocks between
signals, the TLR value should be set to X/2 and the TRM bit should be set.
This process is repeated until the timer is disabled (i.e., TE is cleared).
Bit Settings
Mode Characteristics
TC3
TC2
TC1
TC0
TIO
Clock
#
Function
Name
0
0
0
1
Output
Internal
1
Timer
Pulse
Содержание DSP56309
Страница 25: ...xxii DSP56309UM D MOTOROLA Figure D 25 Port E Registers PCRE PRRE PDRE D 39 ...
Страница 30: ...MOTOROLA DSP56309UM D 1 1 SECTION 1 DSP56309 OVERVIEW ...
Страница 47: ...1 18 DSP56309UM D MOTOROLA DSP56309 Overview DSP56309 Architecture Overview ...
Страница 48: ...MOTOROLA DSP56309UM D 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Страница 85: ...2 38 DSP56309UM D MOTOROLA Signal Connection Descriptions OnCE JTAG Interface ...
Страница 86: ...MOTOROLA DSP56309UM D 3 1 SECTION 3 MEMORY CONFIGURATION ...
Страница 104: ...MOTOROLA DSP56309UM D 4 1 SECTION 4 CORE CONFIGURATION ...
Страница 124: ...MOTOROLA DSP56309UM D 5 1 SECTION 5 GENERAL PURPOSE I O ...
Страница 125: ...5 2 DSP56309UM D MOTOROLA General Purpose I O 5 1 INTRODUCTION 5 3 5 2 PROGRAMMING MODEL 5 3 ...
Страница 128: ...MOTOROLA DSP56309UM D 6 1 SECTION 6 HOST INTERFACE HI08 ...
Страница 166: ...MOTOROLA DSP56309UM D 7 1 SECTION 7 ENHANCED SYNCHRONOUS SERIAL INTERFACE ESSI ...
Страница 212: ...MOTOROLA DSP56309UM D 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Страница 241: ...8 30 DSP56309UM D MOTOROLA Serial Communication Interface SCI GPIO Signals and Registers ...
Страница 242: ...MOTOROLA DSP56309UM D 9 1 SECTION 9 TRIPLE TIMER MODULE ...
Страница 269: ...9 28 DSP56309UM D MOTOROLA Triple Timer Module Timer Operational Modes ...
Страница 270: ...MOTOROLA DSP56309UM D 10 1 SECTION 10 ON CHIP EMULATION MODULE ...
Страница 302: ...MOTOROLA DSP56309UM D 11 1 SECTION 11 JTAG PORT ...
Страница 369: ...C 22 DSP56309UM D MOTOROLA DSP56309 BSDL Listing ...
Страница 370: ...MOTOROLA DSP56309UM D D 1 APPENDIX D PROGRAMMING REFERENCE ...
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