HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 775
HD6417615
Manufacturer Part Number
HD6417615
Description
Hardware Manual
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6417615.pdf
(873 pages)
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20.3
20.3.1
Executing the SLEEP instruction when the SBY bit in SBYCR1 is 0 causes a transition from the
program execution state to sleep mode. Although the CPU halts immediately after executing the
SLEEP instruction, the contents of its internal registers remain unchanged. The on-chip peripheral
modules continue to run in sleep mode.
20.3.2
Sleep mode is canceled by an interrupt, DMA address error, power-on reset, or manual reset.
Cancellation by an Interrupt: When an interrupt occurs, sleep mode is canceled and interrupt
exception handling is executed. Sleep mode is not canceled if the interrupt cannot be accepted
because its priority level is equal to or less than the mask level set in the CPU’s status register
(SR) or if an interrupt by an on-chip peripheral module is disabled at the peripheral module.
Cancellation by a DMA Address Error: If a DMA address error occurs, sleep mode is canceled
and DMA address error exception handling is executed.
Cancellation by a Power-On Reset: A power-on reset cancels sleep mode.
Cancellation by a Manual Reset: A manual reset cancels sleep mode.
20.4
20.4.1
To enter standby mode, set the SBY bit to 1 in SBYCR1, then execute the SLEEP instruction. The
chip switches from the program execution state to standby mode. The NMI interrupt cannot be
accepted when the SLEEP instruction is executed, or for the following five cycles. In standby
mode, the clock supply to all on-chip peripheral modules is halted as well as the CPU. CPU
register contents are held, and some on-chip peripheral modules are initialized.
Sleep Mode
Transition to Sleep Mode
Canceling Sleep Mode
Standby Mode
Transition to Standby Mode
765
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