HD64F2149YV datasheet(797/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1075 Pages

Scroll/Zoom	100%

Fabricante Electrônico	RENESAS [Renesas Technology Corp]

Página de início	http://www.renesas.com

Logo

797 / 1075 page

Section 24 Power-Down State

Rev. 3.00 Jan 18, 2006 page 769 of 1044

REJ09B0280-0300

24.11

Direct Transition

24.11.1

Overview of Direct Transition

There are three operating modes in which the CPU executes programs: high-speed mode, medium-

speed mode, and subactive mode. A transition between high-speed mode and subactive mode

without halting the program is called a direct transition. A direct transition can be carried out by

setting the DTON bit in LPWRCR to 1 and executing a SLEEP instruction. After the transition,

direct transition interrupt exception handling is started.

Direct Transition from High-Speed Mode to Subactive Mode: If a SLEEP instruction is

executed in high-speed mode while the SSBY bit in SBYCR, the LSON bit and DTON bit in

LPWRCR, and the PSS bit in TSCR (WDT1) are all set to 1, a transition is made to subactive

mode.

Direct Transition from Subactive Mode to High-Speed Mode: If a SLEEP instruction is

executed in subactive mode while the SSBY bit in SBYCR is set to 1, the LSON bit is cleared to 0

and the DTON bit is set to 1 in LPWRCR, and the PSS bit in TSCR (WDT1) is set to 1, after the

elapse of the time set in bits STS2 to STS0 in SBYCR, a transition is made to directly to high-

speed mode.

HD64F2149YV Folha de dados(PDF) 797 Page - Renesas Technology Corp