h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 790

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 24 Power-Down State
24.6.3
Bits STS2 to STS0 in SBYCR should be set as described below.
Using a Crystal Oscillator: Set bits STS2 to STS0 so that the standby time is at least 8 ms (the
oscillation settling time).
Table 24.5 shows the standby times for different operating frequencies and settings of bits STS2 to
STS0.
Table 24.5 Oscillation Settling Time Settings
STS2
0
1
Note:
Using an External Clock: Any value can be set. Normally, use of the minimum time is
recommended.
24.6.4
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.
Rev. 3.00 Jan 18, 2006 page 762 of 1044
REJ09B0280-0300
: Recommended time setting
* The maximum operating frequency for the H8S/2169 and H8S/2149 is 10 MHz.
STS1
0
1
0
1
Setting Oscillation Settling Time after Clearing Software Standby Mode
Software Standby Mode Application Example
This setting must not be used in the flash memory version.
STS0
0
1
0
1
0
1
0
1
Standby Time
8192 states
16384 states
32768 states
65536 states
131072 states
262144 states
Reserved
16 states *
0.8
1.6
3.3
6.6
10
MHz
26.2
—
1.6
13.1
8 MHz
1.0
2.0
4.1
16.4
32.8
—
2.0
8.2
6 MHz
1.3
2.7
5.5
21.8
43.6
—
2.7
10.9
4 MHz
2.0
4.1
16.4
32.8
65.6
—
4.0
8.2
2 MHz
4.1
16.4
32.8
65.5
131.2
—
8.0
8.2
Unit
ms
µs