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Chapter 18 Timebase Counter
1.Overview
Chapter 18 Timebase Counter
1. Overview
The timebase counter is a 26-bit up-counter that counts the subclock or the main clock divided by two.
When recovering from a state in which the selected clock source for the MCU has been, or may have been,
halted, the MCU automatically changes to the oscillation stabilization wait state to avoid any unstable output
from the oscillator.
During the oscillation stabilization wait time, supply of internal and external clocks is halted and only the
timebase counter continues to operate until the time set by the oscillation stabilization wait time setting has
elapsed.
The timebase counter, timebase timer, and watchdog timer are collectively called the watchdog control unit.
2. Features
2.1 Timebase Counter (when used to generate the oscillation stabilization wait)
Type
: 26-bit up-counter
Number
: 1
Clock source (F2): Main clock divided by two, or subclock
Clear
: Cleared automatically when changing to oscillation stabilization wait state.
2.2 Events that Invoke an Oscillation Stabilization Wait
■
Events that invoke an oscillation stabilization wait using the timebase counter
●
Wait time after a settings initialization: Invoked automatically (timebase counter)
• INIT Initial oscillation stabilization wait after pin input
• Watchdog reset
• If the main clock oscillation has not been halted: Oscillation stabilization wait not required
• If the main clock oscillation has halted: Oscillation stabilization wait is required
Example: If a watchdog reset occurs during subclock mode with main clock oscillation halted
●
Wait time after recovering from stop mode: Invoked automatically (timebase counter)
• Stop mode cases when clock oscillation circuit is halted:
• The oscillation stabilization wait time for the intended oscillation circuit is required
• Wait time for main PLL to lock is required (if main PLL is used)
• Stop mode cases when clock oscillation circuit is not halted:
Oscillation stabilization wait is not required unless the clock oscillation (main/PLL) has been halted.
●
When recovering from abnormal state with main PLL selected
Automatically goes to the oscillation stabilization wait state to allow time for the main PLL to lock.
26-bit counter
Watchdog timer
Time-base timer
Time-base counter
Base clock
Oscillation stabilization wait control signal
Time-base counter when used to
generate the oscillation stabilization wait
State transition
control circuit
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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