
CHAPTER 24 STANDBY FUNCTION
User’s Manual U17790EJ2V0UD
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Table 24-4. Operation After Releasing IDLE1 Mode by Interrupt Request Signal
Release Source
Interrupt Enabled (EI) Status
Interrupt Disabled (DI) Status
Non-maskable interrupt request
signal
Execution branches to the handler address.
Maskable interrupt request signal
Execution branches to the handler address
or the next instruction is executed.
The next instruction is executed.
(2) Releasing IDLE1 mode by reset
The same operation as the normal reset operation is performed.
Table 24-5. Operating Status in IDLE1 Mode
Setting of IDLE1 Mode
Operating Status
Item
When Subclock Is Not Used
When Subclock Is Used
Main clock oscillator
Oscillation enabled
Subclock oscillator
Oscillation enabled
Internal oscillator
Oscillation enabled
PLL
Operable
CPU
Stops operation
DMA
Stops operation
Interrupt controller
Stops operation (but standby mode release is possible)
ROM correction
Stops operation
Timer P (TMP0 to TMP8)
Stops operation
Timer Q (TMQ0)
Stops operation
Timer M (TMM0)
Operable when fR/8 is selected as the
count clock
Operable when fR/8 or fXT is selected as
the count clock
Watch timer
Operable when fX (divided BRG) is
selected as the count clock
Operable
Watchdog timer 2
Operable when fR is selected as the
count clock
Operable when fR or fXT is selected as
the count clock
CSIB0 to CSIB5
Operable when the SCKBn input clock is selected as the count clock (n = 0 to 5)
I
2C00 to I2C02
Stops operation
Serial interface
UARTA0 to UARTA3
Stops operation (but UARTA0 is operable when the ASCKA0 input clock is selected)
CAN controller
Stops operation
IEBus controller
Stops operation
A/D converter
Holds operation (conversion result held)
Note
D/A converter
Holds operation (output held
Note)
Real-time output function (RTO)
Stops operation (output held)
Key interrupt function (KR)
Operable
CRC arithmetic circuit
Stops operation
External bus interface
See 2.2 Pin States.
Port function
Retains status before IDLE1 mode was set
Internal data
The CPU registers, statuses, data, and all other internal data such as the contents of
the internal RAM are retained as they were before the IDLE1 mode was set.
Note To realize low power consumption, stop the A/D converter and D/A converter before shifting to the IDLE1 mode.