h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 1061

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

Section 23B Power-Down Modes [HD64F2636UF, HD6432636UF, HD64F2638UF,
HD6432638UF, HD64F2638WF, HD6432638WF, HD64F2639UF, HD6432639UF, HD64F2639WF,
HD6432639WF, HD64F2630UF, HD6432630UF, HD64F2630WF, HD6432630WF]
23B.11 Direct Transitions (U-Mask, W-Mask Version, H8S/2635 Group
Only)
23B.11.1 Overview of Direct Transitions
There are three modes, high-speed, medium-speed, and subactive, in which the CPU executes
programs. When a direct transition is made, there is no interruption of program execution when
shifting between high-speed and subactive modes. Direct transitions are enabled by setting the
LPWRCR DTON bit to 1, then executing the SLEEP instruction. After a transition, direct
transition interrupt exception processing starts.
(1) Direct Transitions from High-Speed Mode to Subactive Mode
Execute the SLEEP instruction in high-speed mode when the SBYCR SSBY bit = 1, LPWRCR
LSON bit = 1, and DTON bit = 1, and TSCR (WDT1) PSS bit = 1 to make a transition to
subactive mode.
(2) Direct Transitions from Subactive Mode to High-Speed Mode
Execute the SLEEP instruction in subactive mode when the SBYCR SSBY bit = 1, LPWRCR
LSON bit = 0, and DTON bit = 1, and TSCR (WDT1) PSS bit = 1 to make a direct transition to
high-speed mode after the time set in SBYCR STS2 to STS0 has elapsed.
Rev. 6.00 Feb 22, 2005 page 1001 of 1484
REJ09B0103-0600