Triple Timer Module
Triple Timer Module Programming Model
MOTOROLA
DSP56309UM/D 9-13
The INV bit is cleared by a hardware RESET signal or a software RESET instruction.
The INV bit affects both the timer and GPIO modes. To insure correct operation, this bit
should be changed only when one or both of the following conditions is true:
¥ The timer has been disabled by clearing the TE bit in the TCSR.
¥ The timer is in GPIO mode.
The INV bit does not affect the polarity of the prescaler source when the TIO is used as
input to the prescaler.
9.3.4.6
Timer Reload Mode (TRM) Bit 9
The TRM bit controls the counter preload operation.
In timer (0Ð3) and watchdog (9Ð10) modes, the counter is preloaded with the TLR value
after the TE bit is set and the first internal or external clock signal is received. If the TRM
bit is set, the counter is reloaded each time after it reaches the value contained by the
TCR. In PWM mode (7), the counter is reloaded each time counter overflow occurs. In
measurement (4Ð5) modes, if the TRM and the TE bits are set, the counter is preloaded
with the TLR value on each appropriate edge of the input signal.
If the TRM bit is cleared, the counter operates as a free running counter and is
incremented on each incoming event. The TRM bit is cleared by a hardware RESET
signal or a software RESET instruction.
7
Ñ
Ñ
Pulse generated
by the timer has
positive
polarity
Pulse generated by
the timer has
negative
polarity
9
Ñ
Ñ
Pulse generated
by the timer has
positive
polarity
Pulse generated by
the timer has
negative
polarity
10
Ñ
Ñ
Pulse generated
by the timer has
positive
polarity.
Pulse generated by
the timer has
negative
polarity
Table 9-3
Inverter (INV) Bit Operation (Continued)
Mode
TIO Programmed as Input
TIO Programmed as Output
INV = 0
INV = 1
INV = 0
INV = 1
Содержание DSP56309
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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 ...
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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 ...
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Страница 302: ...MOTOROLA DSP56309UM D 11 1 SECTION 11 JTAG PORT ...
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Страница 370: ...MOTOROLA DSP56309UM D D 1 APPENDIX D PROGRAMMING REFERENCE ...
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