RX610 Group
8. Low Power Consumption
R01UH0032EJ0120 Rev.1.20
Page 194 of 1006
Feb 20, 2013
8.5.3.3
Setting Oscillation Settling Time after Software Standby Mode is Canceled
Set the STS[4:0] bits in SBYCR as follows:
1.
When using a crystal resonator
Set the STS[4:0] bits so that the waiting time is no less than the oscillation settling time.
Table 8.4 shows operating frequencies and waiting time corresponding to each setting of the STS[4:0] bits.
2.
When using an external clock
The PLL circuit settling time is necessary. Set the waiting time referring to table 8.4.
Table 8.4 Oscillation Settling Time Setting
STS4 STS3 STS2 STS1 STS0
Waiting Time
(States)
PCLK
*
(MHz)
Unit
50
25
8
0
0
0
0
0
Reserved
µ
s
1
Reserved
1
0
Reserved
1
Reserved
1
0
0
Reserved
1
64
1.3
2.6
8.0
1
0
512
10.25
20.5
64.0
1
1024
20.5
41.0
128.0
1
0
0
0
2048
40.95
81.9
256.0
1
4096
0.08
0.16
0.51
ms
1
0
16384
0.33
0.66
2.05
1
32768
0.655
1.31
4.10
1
0
0
65536
1.31
2.62
8.19
1
131072
2.62
5.24
16.38
1
0
262144
5.25
10.49
32.77
1
524288
10.49
20.97
65.54
1
x
x
x
x
Reserved
: Recommended time setting when an external clock is used
: Recommended time setting when a crystal resonator is used
Note:
*
The PCLK is the output of the peripheral module frequency divider.
The oscillation settling time (including oscillator’s unstable oscillation time) depends on the resonator
characteristics.
The PCLK values in this table are reference values.