HD6473847RHV Datasheet, PDF (160/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 5 Power-Down Modes
5.3.2 Direct Transition from Active (Medium-Speed) Mode to Active (High-Speed) Mode
The time from the start of SLEEP instruction execution to the end of interrupt exception handling
(the direct transition time) is calculated by equation (2).
Direct transition time = {(Number of SLEEP instruction execution states) + (Number of internal
processing states)} × (tcyc before transition) + (Number of interrupt ex-
ception handling execution states) × (tcyc after transition)
………………..(2)
Example: Direct transition time = (2 + 1) × 16tosc + 14 × 2tosc = 76tosc (when φ/8 is se-
lected as the CPU operating clock)
Legend:
tosc: OSC clock cycle time
tcyc: System clock (φ) cycle time
5.3.3 Direct Transition from Subactive Mode to Active (High-Speed) Mode
The time from the start of SLEEP instruction execution to the end of interrupt exception handling
(the direct transition time) is calculated by equation (3).
Direct transition time = {(Number of SLEEP instruction execution states) + (Number of internal
processing states)} × (tsubcyc before transition) + {(Wait time set in bits
STS2 to STS0) + (Number of interrupt exception handling execution
states)} × (tcyc after transition)
………………..(3)
Example:
Direct transition time = (2 + 1) × 8tw + (8192 + 14) × 2tosc = 24tw + 16412tosc
(when φw/8 is selected as the CPU operating clock and wait time = 8192 states)
Legend:
tosc: OSC clock cycle time
tw: Watch clock cycle time
tcyc: System clock (φ) cycle time
tsubcyc: Subclock (φ_SUB) cycle time
Rev. 7.00 Mar. 08, 2010 Page 128 of 510
REJ09B0024-0700