HD6432633 Datasheet, PDF (1057/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

Table 24-5 Oscillation Stabilization Time Settings
Standby 25 20 16 12 10 8 6 4 2
STS2 STS1 STS0 Time
MHz MHz MHz MHz MHz MHz MHz MHz MHz Unit
0
0
0
8192
0.32 0.41 0.51 0.65 0.8 1.0 1.3 2.0 4.1 ms
states
1
16384 0.65 0.82 1.0 1.3 1.6 2.0 2.7 4.1 8.2
states
1
0
32768 1.3 1.6 2.0 2.7 3.3 4.1 5.5 8.2 16.4
states
1
65536 2.6 3.3 4.1 5.5 6.6 8.2 10.9 16.4 32.8
states
1
0
0
131072 5.2 6.6 8.2 10.9 13.1 16.4 21.8 32.8 65.5
states
1
262144 10.4 13.1 16.4 21.8 26.2 32.8 43.6 65.6 131.2
states
1
0
Reserved — — — — — — — — — µs
1
16 states 0.6 0.8 1.0 1.3 1.6 2.0 1.7 4.0 8.0
(Setting
prohibited)
: Recommended time setting
Using an External Clock: The PLL circuit requires a time for stabilization. Insert a wait of 2 ms
min.
24.6.4 Software Standby Mode Application Example
Figure 24-3 shows an example in which a transition is made to software standby mode at the
falling edge on the NMI pin, and software standby mode is cleared at the rising edge on the NMI
pin.
In this example, an NMI interrupt is accepted with the NMIEG bit in SYSCR cleared to 0 (falling
edge specification), then the NMIEG bit is set to 1 (rising edge specification), the SSBY bit is set
to 1, and a SLEEP instruction is executed, causing a transition to software standby mode.
Software standby mode is then cleared at the rising edge on the NMI pin.
1003