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Clock Generator
6-3
6.4
Description of Operation
6.4.1
Input Frequency Setting
The CG input frequency range is set by the external input pin CKSEL. When CKSEL is set “H”, use an oscillator
or resonator with an input frequency fosci such that 8 MHz
≤
fosci
≤
18 MHz. When CKSEL is set “L”, use an
oscillator or resonator with an input frequency fosci such that 8 MHz
≤
fosci
≤
20 MHz.
Use of an oscillator or resonator that generates a frequency lower than 8 MHz, or higher than 20 MHz is prohibited.
The correspondence between the CKSEL mode and the input frequency range is shown in Table 6-4-1.
Table 6-4-1 CKSEL Mode (PLL used/ PLL not used)
Input frequency range
PLL
CKSEL mode
8 MHz
≤
fosci
≤
18 MHz
When using
H
8 MHz
≤
fosci
≤
20 MHz
When not using
L
6.4.2
Internal Clock Supply
When external input pin CKSEL is “H”, the frequency of the CPU core/internal RAM/bus controller operation
clock (MCLK) is 1x, 2x or 4x the input frequency, depending on the setting of the clock control register, and the
frequency of the internal peripheral function operation clock (IOCLK) is 1/4x MCLK. Note that the clock that is
supplied to external devices (SYSCLK) has the same frequency as the input frequency.
When external input pin CKSEL is “L”, the frequency of the CPU core/internal RAM/bus controller operation
clock (MCLK) is 1/2x the input frequency, and the frequency of the internal peripheral function operation clock
(IOCLK) is 1/8x the input frequency. Note that the clock that is supplied to external devices (SYSCLK) 1/2x the
input frequency.
Note: For details on the clock control register settings, refer to section 8.6.8, “Clock Control Register.”
When the reset state is released, SYSCLK, MCLK, and IOCLK are supplied starting after a certain oscillation
stabilization wait time.
Note: For details on the oscillation stabilization wait time, refer to Chapter 12, “Watchdog Timer.”
Note 1: When a clock is supplied from external, input the clock to the OSCI pin, and leave the OSCO pin open.
Note 2: The in-circuit emulator (ICE) cannot operate with self-excited oscillators in the microcontroller. Use the
clock generated in the target system.
When the clock is generated in the target system, supply the clock to the in-circuit emulator main unit
through a buffer with adequate drive capability. The in-circuit emulator will not operate correctly if the
amplitude of the clock is inadequate, the clock signal is noisy, or the buffer has inadequate drive capability.
Summary of Contents for MN103001G/F01K
Page 1: ...MICROCOMPUTER MN1030 MN103001G F01K LSI User s Manual Pub No 23101 050E ...
Page 2: ......
Page 4: ......
Page 6: ......
Page 8: ......
Page 9: ...Table of Contents List of Figures and Tables 0 ...
Page 26: ...xviii ...
Page 27: ...1 0 1 General Specifications ...
Page 35: ...2 CPU 2 ...
Page 57: ...3 Extension Instruction Specifications 3 ...
Page 96: ...Extension Instruction Specifications 3 40 ...
Page 97: ...4 Memory Modes 3 4 ...
Page 102: ...Memory Modes 4 6 ...
Page 103: ...5 Operating Mode 5 ...
Page 107: ...6 Clock Generator 6 13 ...
Page 111: ...7 Internal Memory 7 ...
Page 114: ...Internal Memory 7 4 ...
Page 115: ...8 Bus Controller BC 8 ...
Page 189: ...9 Interrupt Controller 9 ...
Page 220: ...Interrupt Controller 9 32 ...
Page 221: ...10 8 bit Timers 9 10 ...
Page 254: ...8 bit Timers 10 34 ...
Page 255: ...11 16 bit Timers 11 ...
Page 292: ...16 bit Timers 11 38 ...
Page 293: ...12 Watchdog Timer 11 12 ...
Page 302: ...Watchdog Timer 12 10 ...
Page 303: ...13 Serial Interface 13 ...
Page 354: ...Serial Interface 13 52 ...
Page 355: ...14 A D Converter 14 ...
Page 367: ...15 I O Ports 15 ...
Page 431: ...16 Internal Flash Memory 16 ...
Page 439: ...17 17 Ordering Mask ROM ...
Page 442: ...Ordering Mask ROM 17 4 ...
Page 443: ...Appendix ...