10
10-95
Ver.0.10
MULTIJUNCTION TIMERS
10.3 TOP (Output-related 16-bit Timer)
(3) Precautions to be observed when using TOP delayed single-shot output mode
The following describes precautions to be observed when using TOP delayed single-shot output
mode.
• If the counter stops due to underflow in the same clock period as the timer is enabled by
external input, the former has priority (so that the counter stops).
• If the counter stops due to underflow in the same clock period as count is enabled by writing to
the enable bit, the latter has priority (so that count is enabled).
• If the timer is enabled by external input in the same clock period as count is disabled by writing
to the enable bit, the latter has priority (so that count is disabled).
• Even when the counter overflows due to correction of counts, no interrupt is generated for the
occurrence of overflow. When the counter underflows in the subsequent down-count after
overflow, a false underflow interrupt is generated due to overcounting.
• When you read the counter immediately after reloading it pursuant to underflow, the value you
get is temporarily H'FFFF. But this counter value immediately changes to (reload value - 1) at
the next clock edge.
Figure 10.3.19 Counter Value Immediately after Underflow
Count clock
Enable bit
"H"
H'0001
H'0000
H'FFFF
H'AAA9
H'AAA8
Counter value
H'AAAA
Reload register
Reload due to
underflow
H'(AAAA-1)
H'(AAAA-2)
During reload cycle, you always see H'FFFF,
and not the reload register value (in this case,
H'AAAA).
Down-count starting
from reloaded register
value
Reload
cycle
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...