upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 143

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(3) Oscillation stabilization time select register (OSTS)
6.4 Power Save Functions
6.4.1 General
of low-power systems.
(1) HALT mode
(2) IDLE mode
After reset:
OSTS
This product provides the following power saving functions.
These modes can be combined and switched to suit the target application, which enables effective implementation
This register can be read/written in 8-bit units.
When in this mode, the clock’s oscillator continues to operate but the CPU’s operating clock is stopped. A clock
continues to be supplied for other on-chip peripheral functions to maintain operation of those functions. This
enables the system’s total power consumption to be reduced.
A dedicated instruction (the HALT instruction) is used to switch to HALT mode.
This mode stops the entire system by stopping the CPU’s operating clock as well as the operating clock for on-
chip peripheral functions other than for the watch timer while the clock oscillator is still operating. However, the
subclock continues to operate and supplies a clock to the on-chip peripheral functions.
When this mode is released, there is no need for the oscillator to wait for the oscillation stabilization time, so
normal operation can be resumed quickly.
When the IDLE bit of the power save control register (PSC) is set to 1, the system switches to IDLE mode.
Note The numerical value in parentheses is the value when f
04H
Other than above
OSTS2
7
0
0
0
0
0
1
R/W
OSTS1
6
0
0
0
1
1
0
CHAPTER 6 CLOCK GENERATION FUNCTION
Address: FFFFF380H
OSTS0
0
1
0
1
0
User’s Manual U12768EJ4V1UD
5
0
2
2
2
2
2
Setting prohibited
14
16
17
18
19
/f
/f
/f
/f
/f
XX
XX
XX
XX
XX
4
0
(819.2
(3.3 ms)
(6.6 ms)
(13.1 ms)
(26.2 ms)
Selection of Oscillation Stabilization Time
µ
s)
3
0
XX
= 20 MHz.
OSTS2
2
OSTS1
1
Note
OSTS0
0
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