h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 1016

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 23A Power-Down Modes [HD64F2636F, HD64F2638F, HD6432636F, HD6432638F,
HD64F2630F, HD6432630F, HD64F2635F, HD6432635F, HD6432634F]
23A.2 Register Descriptions
23A.2.1 Standby Control Register (SBYCR)
SBYCR is an 8-bit readable/writable register that performs power-down mode control.
SBYCR is initialized to H'58 by a reset and in hardware standby mode. It is not initialized in
software standby mode.
Bit 7—Software Standby (SSBY): When making a low power dissipation mode transition by
executing the SLEEP instruction, the operating mode is determined in combination with other
control bits.
Note that the value of the SSBY bit does not change even when shifting between modes using
interrupts.
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the MCU wait time
for clock stabilization when shifting to high-speed mode or medium-speed mode by using a
specific interrupt or command to cancel software standby mode. With a quartz oscillator (Table
23A-5), select a wait time of 8ms (oscillation stabilization time) or more, depending on the
operating frequency. With an external clock, select a standby time of 2 ms or more (PLL oscillator
settling time), based on the operating frequency.
Rev. 6.00 Feb 22, 2005 page 956 of 1484
REJ09B0103-0600
Bit 7
SSBY
0
1
Description
Shifts to sleep mode when the SLEEP instruction is executed in high-speed
mode or medium-speed mode.
Shifts to software standby mode when the SLEEP instruction is executed in high-
speed mode or medium-speed mode.
¾
¾
¾
¾
(Initial value)
¾
¾