h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 498

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

20.1.1
SBYCR controls power-down modes.
[Legend]
X:
Rev. 1.00, 05/04, page 464 of 544
2
1
0
Bit
7
6
5
4
3
Don't care
SCK2
SCK1
SCK0
Bit Name
STS2
STS1
STS0

SSBY
Standby Control Register (SBYCR)
0
0
0
Initial
Value
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
System Clock Select 2 to 0
Selects a clock for the bus master in high-speed mode
or medium-speed mode.
When making a transition to subactive mode or watch
mode, SCK2 to SCK0 must be cleared to 0.
000: High-speed mode
001: Medium-speed clock: φ/2
010: Medium-speed clock: φ/4
011: Medium-speed clock: φ/8
100: Medium-speed clock: φ/16
101: Medium-speed clock: φ/32
11X: —
Description
Software Standby
Specifies the operating mode to be entered after
executing the SLEEP instruction.
When the SLEEP instruction is executed in high-speed
mode or medium-speed mode:
0: Shifts to sleep mode
1: Shifts to software standby mode, subactive mode, or
When the SLEEP instruction is executed in subactive
mode:
0: Shifts to subsleep mode
1: Shifts to watch mode or high-speed mode
Note that the SSBY bit is not changed even if a mode
transition occurs by an interrupt.
Standby Timer Select 2 to 0
Selects the wait time for clock stabilization from clock
oscillation start when canceling software standby mode,
watch mode, or subactive mode. Select a wait time of 8
ms (oscillation stabilization time) or more, depending on
the operating frequency. Table 20.1 shows the
relationship between the STS2 to STS0 values and wait
time.
With an external clock, there are no specific wait
requirements. Normally the minimum value is
recommended.
Reserved
This bit is always read as 0, and cannot be modified.
watch mode