10
10-12
Ver.0.10
MULTIJUNCTION TIMERS
10.2 Common Units of Multijunction Timer
10.2.2 Prescaler Unit
The prescalers PRS0-5 are an 8-bit counter, which generates clocks supplied to each timer (TOP,
TIO, TMS, TML, TID, TOD, and TOM) from the divide-by-2 frequency of the internal peripheral
clock (10.0 MHz when the internal peripheral clock = 20 MHz).
The values of prescaler registers are initialized to H'00 when reset. Also, when you rewrite the set
value of any prescaler register, the device starts operating with the new value simultaneously when
the prescaler underflows.
Values H'00 to H'FF can be set in the counter registers of prescalers. The prescalers' divide-by
ratios are given by the equation below.
1
Prescaler divide-by ratio = —————
Prescaler set value + 1
■
Prescaler Register 0 (PRS0)
<Address: H'0080 0202>
■
Prescaler Register 1 (PRS1)
<Address: H'0080 0203>
■
Prescaler Register 2 (PRS2)
<Address: H'0080 0204>
■
Prescaler Register 3 (PRS3)
<Address: H'0080 07D0>
■
Prescaler Register 4 (PRS4)
<Address: H'0080 0BD0>
■
Prescaler Register 5 (PRS5)
<Address: H'0080 0CD0>
D0
1
2
3
4
5
6
D7
( D8
9
10
11
12
13
14
D15 )
PRS0 - PRS5
<When reset : H'00>
D
Bit Name
Function
R
W
0 - 7
PRS0, 2 - 5
Sets the prescaler's divide-by value
8 - 15
PRS1
Prescaler Registers 0-2 start counting after reset removal. Prescaler Registers 3-5 each are
activated by setting the TID0 Control & Prescaler 3 Enable Register, TID1 Control & Prescaler 4
Enable Register, and TID2 Control & Prescaler 5 Enable Register to 1 (= count start), upon which
they reload the prescaler register value and start counting. For details, refer to Section 10.7, "TID
(Input-related 16-bit Timer)."
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...