20
20-2
Rev.1.0
OSCILLATION CIRCUIT
20.1 Oscillator Circuit
Figure 20.1.1 Example of a System Clock Generating Circuit
20.1 Oscillator Circuit
The M32R/E contains an oscillator circuit that supplies operating clocks for the CPU core, internal
peripheral I/O, and internal memory. The frequency fed to the clock input pin (XIN) is multiplied by
4 by the internal PLL circuit to produce the CPU clock, which is the operating clock for the CPU core
and internal memory. The frequency of this clock is divided by 2 in the subsequent circuit to
produce the internal peripheral clock, which is the operating clock for the internal peripheral I/O.
20.1.1 Example of an Oscillator Circuit
A clock generating circuit can be configured by connecting a ceramic (or crystal) resonator between
the XIN and XOUT pins external to the chip. Figure 20.1.1 below shows an example of a system
clock generating circuit using a resonator connected external to the chip and an RC network
connected to the PLL circuit control pin (VCNT). For constants Rf, CIN, COUT, and Rd, consult
your resonator manufacturer to determine the appropriate values.
When you use an externally sourced clock signal without using the internal oscillator circuit,
connect the external clock signal to the XIN pin and leave the XOUT pin open.
M32R/E
OSCVCC
XIN
XOUT
OSCVSS
Rf
Rd
C
IN
C
OUT
VCNT
BCLK / P70
C
Oscillator
circuit
To internal
peripheral
clock
PLL circuit
220pF(Note)
0.1µF
(Note)
1K
Ω
Oscillator module
OSCVCC : 3.3 V power supply
To CPU clock
1/2
Note: allowable error
±
10%
(Note)
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 ...