Fujitsu FR81S Manual Do Utilizador
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CHAPTER 5: CLOCK
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : CLOCK
FUJITSU SEMICONDUCTOR CONFIDENTIAL
26
4.9. Clock Stabilization Selection Register : CSTBR (Clock
STaBilization selection Register)
The bit configuration of the oscillation stabilization selection register is shown.
This register configures the oscillation stabilization wait for each clock source.
The oscillation stabilization wait time set by this register will be used at the time when returning from the
stop/watch mode. It will also be used for a period from the time when the oscillation of a clock which have not
been selected as the source clock is allowed until the ready status (CMONR:*CRDY) of that clock switches to
"1". If an oscillation stabilization wait is necessary at reset, it will always be set to the stabilization wait time
selected as an initial value by this register. Write operations to MOSW[3:0] will not be effective at the main
clock oscillation stabilization wait time (MCEN=1 and MCRDY=0).
Write operations to SOSW[2:0] will not be effective at the sub clock oscillation stabilization wait time
(SCEN=1 and SCRDY=0).
CSTBR: Address 0516
H
(Access : Byte, Half-word, Word)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Reserved
SOSW[2:0]
MOSW[3:0]
Initial value
0
0
0
0
0
0
0
0
Attribute R0,WX
R,W
R,W
R,W
R,W
R,W
R,W
R,W
[bit7] (Reserved)
[bit6 to bit4] : SOSW[2:0] (Sub clock OSc Wait) : Sub clock oscillation stabilization wait selection
These bits select the oscillation stabilization wait time for the sub clock (SBCLK) as follows.
SOSW[2:0]
Sub clock oscillation
stabilization wait time
At 32kHz
At CR clock
selected
000
2
8
× sub clock cycle (Initial value)
8[ms]
5.12[ms]
001
2
9
× sub clock cycle
16[ms]
10.24[ms]
010
2
10
× sub clock cycle
32[ms]
20.48[ms]
011
2
11
× sub clock cycle
64[ms]
40.96[ms]
100
2
12
× sub clock cycle
128[ms]
81.92[ms]
101
2
13
× sub clock cycle
0.256[s]
163.84[ms]
110
2
14
× sub clock cycle
0.512[s]
327.68[ms]
111
2
15
× sub clock cycle
1.024[s]
655.36[ms]
MB91520 Series
MN705-00010-1v0-E
187