
5-7
ML63326 User's Manual
Chapter 5 Clock Generator Circuit (OSC)
5
5.6 Frequency Control Register (FCON)
FCON is a special function register (SFR) that selects the system clock.
—
OSCSEL
ENOSC
CPUCLK
RC oscillation/ceramic oscillation mode select
0: RC oscillation mode (initial value)
1: Crystal oscillation mode
High-speed clock oscillation start/stop select
0: Oscillation stop (initial value)
1: Oscillation start
System clock select
0: Low-speed clock oscillation output (initial value)
1: High-speed clock oscillation output
FCON (062H)
(R/W)
bit 3
bit 2
bit 1
bit 0
bit 2: OSCSEL
This bit selects the RC oscillation mode or the crystal oscillation mode of the high-
speed clock generator circuit. At system reset, this bit is cleared to "0", selecting
the RC oscillation mode.
bit 1: ENOSC
This bit starts and stops oscillation of the high-speed clock generator circuit. At
system reset, this bit is cleared to "0", stopping oscillation of the high-speed clock
generator circuit.
bit 0: CPUCLK
This bit selects the system clock, the basic operation clock of the CPU. At system
reset, this bit is cleared to "0", selecting output of the low-speed clock generator
circuit (TBCCLK).
Summary of Contents for ML63326
Page 3: ......
Page 13: ......
Page 14: ...Chapter 1 Overview 1 ...
Page 15: ......
Page 37: ...1 22 ML63326 User s Manual Chapter 1 Overview ...
Page 38: ...Chapter 2 CPU and Memory Spaces 2 ...
Page 39: ......
Page 50: ...CPU Control Functions Chapter 3 3 ...
Page 51: ......
Page 57: ...3 6 ML63326 User s Manual Chapter 3 CPU Control Functions ...
Page 58: ...Interrupt INT326 Chapter 4 4 ...
Page 59: ......
Page 71: ...4 12 ML63326 User s Manual Chapter 4 Interrupt INT326 ...
Page 72: ...Clock Generator Circuit OSC Chapter 5 5 ...
Page 73: ......
Page 83: ...5 10 ML63326 User s Manual Chapter 5 Clock Generator Circuit OSC ...
Page 84: ...Time Base Counter TBC Chapter 6 6 ...
Page 85: ......
Page 90: ...Timers TIMER Chapter 7 7 ...
Page 91: ......
Page 115: ...7 24 ML63326 User s Manual Chapter 7 Timers TIMER ...
Page 116: ...Chapter 8 8 100 Hz Timer Counter 100HzTC ...
Page 117: ......
Page 121: ...8 4 ML63326 User s Manual Chapter 8 100 Hz Timer Counter 100HzTC ...
Page 122: ...Chapter 9 9 Watchdog Timer WDT ...
Page 123: ......
Page 128: ...Chapter 10 10 Ports INPUT OUTPUT I O PORT ...
Page 129: ......
Page 170: ...Chapter 11 11 External Memory Transfer Function EXTMEM ...
Page 171: ......
Page 179: ...11 8 ML63326 User s Manual Chapter 11 External Memory Transfer Function EXTMEM ...
Page 180: ...Chapter 12 12 Melody Driver MELODY63K ...
Page 181: ......
Page 195: ...12 14 ML63326 User s Manual Chapter 12 Melody Driver MELODY63K ...
Page 196: ...13 Chapter 13 Voice Synthesis ...
Page 197: ......
Page 228: ...14 Chapter 14 Shift Register SFT ...
Page 229: ......
Page 236: ...15 Chapter 15 LCD Driver LCD ...
Page 237: ......
Page 250: ...16 Chapter 16 Battery Low Detect Circuit BLD ...
Page 251: ......
Page 255: ...16 4 ML63326 User s Manual Chapter 16 Battery Low Detect Circuit BLD ...
Page 256: ...Chapter 17 17 Power Supply Circuit POWER ...
Page 257: ......
Page 260: ...Appendixes ...
Page 261: ......
Page 321: ...Appendix 60 ML63326 User s Manual Appendix G ...