hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 128

• Manufacturer Part Number: hd66100
• Description: H8/3867 Series
• Manufacturer: Renesas Electronics Corporation.

2. Time for direct transition from active (medium-speed) mode to active (high-speed) mode
A direct transition from active (medium-speed) mode to active (high-speed) mode is performed by
executing a SLEEP instruction in active (medium-speed) mode while bits SSBY and LSON are
both cleared to 0 in SYSCR1, and bit MSON is cleared to 0 and bit DTON is set to 1 in SYSCR2.
The time from execution of the SLEEP instruction to the end of interrupt exception handling (the
direct transition time) is given by equation (2) below.
Direct transition time = { (Number of SLEEP instruction execution states) + (number of internal
Example: Direct transition time = (2 + 1)
Notation:
tosc: OSC clock cycle time
tcyc: System clock (ø) cycle time
3. Time for direct transition from subactive mode to active (high-speed) mode
A direct transition from subactive mode to active (high-speed) mode is performed by executing a
SLEEP instruction in subactive mode while bit SSBY is set to 1 and bit LSON is cleared to 0 in
SYSCR1, bit MSON is cleared to 0 and bit DTON is set to 1 in SYSCR2, and bit TMA3 is set to 1
in TMA. The time from execution of the SLEEP instruction to the end of interrupt exception
handling (the direct transition time) is given by equation (3) below.
Direct transition time = { (Number of SLEEP instruction execution states) + (number of internal
Example: Direct transition time = (2 + 1)
Notation:
tosc:
tw:
tcyc:
tsubcyc: Subclock (øSUB) cycle time
OSC clock cycle time
Watch clock cycle time
System clock (ø) cycle time
the CPU operating clock)
øw/8 is selected as the CPU operating clock, and wait time = 8192 states)
processing states) }
exception handling execution states) (tcyc after transition)
processing states) }
STS2 to STS0) + (number of interrupt exception handling execution
states) } (tcyc after transition)
16tosc + 14 2tosc = 76tosc (when ø/8 is selected as
8tw + (8192 + 14) 2tosc = 24tw + 16412tosc (when
(tcyc before transition) + (number of interrupt
(tsubcyc before transition) + { (wait time set in
.................................. (2)
........................ (3)
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