Renesas H8 Series Hardware Manual

Section 5 Power-Down Modes
Rev. 7.00 Mar 10, 2005 page 123 of 652
REJ09B0042-0700
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0)
These bits designate the time the CPU and peripheral modules wait for stable clock operation after
exiting from standby mode or watch mode to active mode due to an interrupt. The designation
should be made according to the operating frequency so that the waiting time is at least equal to
the oscillation stabilization time. Note that stabilization times for the H8/38024, H8/38024S, and
H8/38024R Group and for the H8/38124 Group are different.
• H8/38024, H8/38024S, H8/38024R Group
Bit 6
STS2
Bit 5
STS1
Bit 4
STS0 Description
000Wait time = 8,192 states (initial value)
001Wait time = 16,384 states
010Wait time = 1,024 states
011Wait time = 2,048 states
100Wait time = 4,096 states
101Wait time = 2 states(External clock input mode)
110Wait time = 8 states
111Wait time = 16 states
• H8/38124 Group
Bit 6
STS2
Bit 5
STS1
Bit 4
STS0 Description
000Wait time = 8,192 states (initial value)
001Wait time = 16,384 states
010Wait time = 32,768 states
011Wait time = 65,536 states
100Wait time = 131,072 states
101Wait time = 2 states(External clock input mode)
110Wait time = 8 states
111Wait time = 16 states
Note: If an external clock is being input, set standby timer select to external clock mode before
mode transition. Also, do not set standby timer select to external clock mode if no external
clock is used. 8,192 states (STS2 = STS1 = STS0 = 0) is recommended if the on-chip
oscillator is used on the H8/38124 Group.

Renesas H8 Series Specifications

General

Brand	Renesas
Model	H8 Series
Category	Computer Hardware
Language	English