10
10-111
Rev.1.0
10.6.16 Operation of TOM in Successive Output Mode (without Correction Function)
(1) Outline of successive output mode for TOM
In successive output mode, the counter counts down from its set value and upon underflowing, it
is loaded with the value of the reload 0 register. Therefore, this operation is repeated each time
the counter underflows, thereby successively generating a pulse in duration of the reload 0
register set value + 1.
When the timer is enabled after setting the counter and the reload 0 register, the counter starts
counting down from its set value synchronously with the count clock.
When the counter underflows after reaching the minimum count, it is loaded with the content of
the reload 0 register and starts counting again. This is repeated each time the counter
underflows. To stop the counter, write to the enable bit in software to disable counting.
The F/F output waveform in successive output mode is inverted (F/F output changes level from
low to high or vice versa) when the counter starts counting and when it underflows, thereby
successively generating a pulse waveform until the count stops.
An interrupt and a DMA transfer request can be generated each time the counter underflows.
The counter set value + 1 and the reload 0 register set value + 1 are the valid count values.
(2) Precautions on using TOM in successive output mode
The following describes precautions to be observed when using the TOM in successive output
mode.
•
If the counter is enabled by external input while it is disabled against counting by writing to the
enable bit in the same clock cycle, the latter has priority so that the counter is disabled against
counting.
•
When the counter is read immediately after being reloaded pursuant to underflowing, it
temporarily shows the value H'FFFF which, however, immediately changes to the "reload
value - 1" in the next clock cycle.
•
Because the internal circuit operation is synchronized to the count clock (prescaler output), a
prescaler equivalent delay time exists before the F/F starts operation after being enabled.
INPUT/OUTPUT TIMERS
10.6 TOM (Output Related 16-bit Timers)
Содержание 32172
Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...