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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.
Main clock
(Source oscillation)
2. Features
• Type
• Quantity
• Clock source
• Interval time
• Cause of timer clear: (Software, overflow, reset (INIT))
• Operation start/stop : Can be operated/stopped by the software.
• Interrupt
• Count value
Up-counter
: 23-bit free run counter
: 1
: Main clock (source oscillation) --- Period = 1/F
: 3 types
12
Period =2
/F
, 2
CL-MAIN
(1.0ms, 32.7ms, 2s / main clock 4MHz)
: Main clock oscillation stability wait interrupt (Interval interrupt)
: Cannot read/write. (Clear only)
Chapter 22 Main Oscillation Stabilisation Timer
Selector
17
23
/F
, 2
/F
CL-MAIN
CL-MAIN
Interrupt
CL-MAIN
,
1.Overview
289
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