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Chapter 22 Main Oscillation Stabilisation Timer
1.Overview
Chapter 22 Main Oscillation Stabilisation Timer
1. Overview
The main clock oscillation stabilisation timer is a 23-bit counter that counts the main clock. This timer does not
affect the selection of clock source operated by MCU/dividing setting.
This timer is mainly used for acquiring main clock oscillation stability wait time to resume main clock oscillation
after the main clock oscillation has been stopped (OSCCR.OSCDS1=1) while the subclock is being operated.
In addition, this timer is best suited for interval timers or system clocks for real time OS.
2. Features
• Type : 23-bit free run counter
• Quantity : 1
• Clock source : Main clock (source oscillation) --- Period = 1/F
CL-MAIN
• Interval time : 3 types
Period =2
12
/F
CL-MAIN
, 2
17
/F
CL-MAIN
, 2
23
/F
CL-MAIN
,
(1.0ms, 32.7ms, 2s / main clock 4MHz)
• Cause of timer clear: (Software, overflow, reset (INIT))
• Operation start/stop : Can be operated/stopped by the software.
• Interrupt : Main clock oscillation stability wait interrupt (Interval interrupt)
• Count value : Cannot read/write. (Clear only)
Main clock
(Source oscillation)
Up-counter
Selector
Interrupt