742
22.6
Software Standby Mode
22.6.1
Software Standby Mode
A transition is made to software standby mode when the SLEEP instruction is executed when the
SBYCR SSBY bit = 1 and the LPWRCR LSON bit = 0, and the TCSR (WDT1) PSS bit = 0. In
this mode, the CPU, on-chip supporting modules, and oscillator all stop. However, the contents of
the CPU’s internal registers, RAM data, and the states of on-chip supporting modules other than
the SCI, A/D converter, Motor control PWM, HCAN and I/O ports, are retained. Whether the
address bus and bus control signals are placed in the high-impedance state.
In this mode the oscillator stops, and therefore power dissipation is significantly reduced.
22.6.2
Clearing Software Standby Mode
Software standby mode is cleared by an external interrupt (NMI pin, or pins
IRQ0
to
IRQ5
), or by
means of the
RES
pin or
STBY
pin.
•
Clearing with an interrupt
When an NMI or IRQ0 to IRQ5 interrupt request signal is input, clock oscillation starts, and
after the elapse of the time set in bits STS2 to STS0 in SYSCR, stable clocks are supplied to
the entire H8S/2646 Series chip, software standby mode is cleared, and interrupt exception
handling is started.
When clearing software standby mode with an IRQ0 to IRQ5 interrupt, set the corresponding
enable bit to 1 and ensure that no interrupt with a higher priority than interrupts IRQ0 to IRQ5
is generated. Software standby mode cannot be cleared if the interrupt has been masked on the
CPU side or has been designated as a DTC activation source.
•
Clearing with the
RES
pin
When the
RES
pin is driven low, clock oscillation is started. At the same time as clock
oscillation starts, clocks are supplied to the entire H8S/2646 Series chip. Note that the
RES
pin must be held low until clock oscillation stabilizes. When the
RES
pin goes high, the CPU
begins reset exception handling.
•
Clearing with the
STBY
pin
When the
STBY
pin is driven low, a transition is made to hardware standby mode.
Содержание H8S/2645
Страница 4: ......
Страница 16: ......
Страница 58: ...26 ...
Страница 110: ...78 ...
Страница 120: ...88 ...
Страница 132: ...100 ...
Страница 160: ...128 ...
Страница 172: ...140 ...
Страница 235: ...203 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 8 8 Memory Mapping in Block Transfer Mode ...
Страница 418: ...386 ...
Страница 444: ...412 ...
Страница 530: ...498 ...
Страница 562: ...530 ...
Страница 642: ...610 ...
Страница 662: ...630 ...
Страница 688: ...656 ...
Страница 756: ...724 ...
Страница 784: ...752 ...
Страница 812: ...780 ...
Страница 837: ...805 A 2 Instruction Codes Table A 2 shows the instruction codes ...
Страница 1152: ...1120 ...