Rev. 6.00, 08/04, page 134 of 628
5.7
Active (Medium-Speed) Mode
5.7.1
Transition to Active (Medium-Speed) Mode
If the MSON bit in SYSCR2 is set to 1 while the LSON bit in SYSCR1 is cleared to 0, a transition
to active (medium-speed) mode results from IRQ
0
, IRQ
1
or WKP
7
to WKP
0
interrupts in standby
mode, timer A, timer F, timer G, IRQ
0
, or WKP
7
to WKP
0
interrupts in watch mode, or any
interrupt in sleep mode. A transition to active (medium-speed) mode does not take place if the I
bit of CCR is set to 1 or the particular interrupt is disabled in the interrupt enable register.
Furthermore, it sometimes acts with half state early timing at the time of transition to active
(medium-speed) mode.
5.7.2
Clearing Active (Medium-Speed) Mode
Active (medium-speed) mode is cleared by a SLEEP instruction.
•
Clearing by SLEEP instruction
A transition to standby mode takes place if the SLEEP instruction is executed while the SSBY
bit in SYSCR1 is set to 1, the LSON bit in SYSCR1 is cleared to 0, and the TMA3 bit in TMA
is cleared to 0. The system goes to watch mode if the SSBY bit in SYSCR1 is set to 1 and bit
TMA3 in TMA is set to 1 when a SLEEP instruction is executed.
When both SSBY and LSON are cleared to 0 in SYSCR1 and a SLEEP instruction is executed,
sleep mode is entered. Direct transfer to active (high-speed) mode or to subactive mode is also
possible. See section 5.8, Direct Transfer, below for details.
•
Clearing by
RES
pin
When the
RES
pin is driven low, a transition is made to the reset state and active (medium-
speed) mode is cleared.
5.7.3
Operating Frequency in Active (Medium-Speed) Mode
Operation in active (medium-speed) mode is clocked at the frequency designated by the MA1 and
MA0 bits in SYSCR1.
Содержание H8/38024 Series
Страница 18: ...Rev 6 00 08 04 page xviii of xxx...
Страница 30: ...Rev 6 00 08 04 page xxx of xxx...
Страница 130: ...Rev 6 00 08 04 page 100 of 628...
Страница 216: ...Rev 6 00 08 04 page 186 of 628...
Страница 416: ...Rev 6 00 08 04 page 386 of 628...
Страница 432: ...Rev 6 00 08 04 page 402 of 628...
Страница 468: ...Rev 6 00 08 04 page 438 of 628...
Страница 661: ...H8 38024 H8 38024S H8 38024F ZTAT H8 38124 Group Hardware Manual...