FUJITSU MB91460 SERIES FR60 - Manual (Page 315)

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Chapter 23 Sub Oscillation Stabilisation Timer
1.Overview
Chapter 23 Sub Oscillation Stabilisation Timer
1. Overview
The sub oscillation stabilisation timer is a 15-bit counter that is counted up with the subclock. This timer does
not affect the selection/dividing setting of the MCU operating clock.
This timer is used to acquire subclock oscillation stability wait time if the subclock oscillation is resumed mainly
when the subclock oscillation is stopped while the main clock is in operation.
This timer is can be used for acquiring sub clock oscillation stability wait time to resume sub clock oscillation
after the sub clock oscillation has been stopped (OSCCR.OSCDS2=1) while the RC oscillator is being
operated.
2. Features
• Type : 15-bit free run counter
• Quantity : 1
• Clock source : Subclock (source oscillation) --- Period = 1/F
CL-SUB
= 1/32.768kHz
• Interval time : 4 types
Period = 2
10
/F
CL-SUB
, 2
13
/F
CL-SUB
, 2
14
/F
CL-SUB
, 2
15
/F
CL-SUB
,
(31.25ms, 0.25s, 0.50s, 1.00s)
• Timer clear cause: (Software, overflow, reset (INIT))
• Interrupt : clock interrupt (interval interrupt)
• Count value : Cannot read and write (Clear only)
Sub clock
(Source oscillation)
Up-counter Selector Interrupt