HD6433635SW datasheet(118/418 Pages) RENESAS

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to 1, and bit TMA3 in TMA is set to 1, a transition is made directly to active (medium-speed)

mode via watch mode after the waiting time set in SYSCR1 bits STS2 to STS0 has elapsed.

5.8.2

Direct Transfer Time

Time for Direct Transfer from Active (High-Speed) Mode to Active (Medium-Speed)

Mode: When a SLEEP instruction is executed in active (high-speed) mode while the SSBY

bit in SYSCR1 is cleared to 0, the LSON bit in SYSCR1 is cleared to 0, the MSON bit in

SYSCR2 is set to 1, and the DTON bit in SYSCR2 is set to 1, a transition is made directly to

active (medium-speed) mode. In this case, the time from execution of the SLEEP instruction

to the end of interrupt exception handling (the direct transfer time) is given by equation (1)

below:

Direct transfer time ={ (Number of SLEEP instruction execution states) +

(number of internal processing states) }

× (t

cyc before transition) +

(number of interrupt exception handling execution states)

cyc after transition) ...................................................................... (1)

Example: H8/3637S Series direct transfer time = (2 + 1)

× 2t

osc + 14 × 16tosc = 230tosc

Legend:

osc: OSC clock cycle time

cyc: System clock (ø) cycle time

Time for Direct Transfer from Active (Medium-Speed) Mode to Active (High-Speed)

Mode: When a SLEEP instruction is executed in active (medium-speed) mode while the

SSBY bit in SYSCR1 is cleared to 0, the LSON bit in SYSCR1 is cleared to 0, the MSON bit

in SYSCR2 is cleared to 0, and the DTON bit in SYSCR2 is set to 1, a transition is made

directly to active (high-speed) mode. In this case, the time from execution of the SLEEP

instruction to the end of interrupt exception handling (the direct transfer time) is given by

equation (2) below:

Direct transfer time ={ (Number of SLEEP instruction execution states) +

(number of internal processing states) }

× (t

cyc before transition) +

(number of interrupt exception handling execution states)

cyc after transition) ...................................................................... (2)

Example: H8/3637S Series direct transfer time = (2 + 1)

× 16t

osc + 14 × 2tosc = 76tosc

Legend:

osc: OSC clock cycle time

cyc: System clock (ø) cycle time

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