
CHAPTER 6 CLOCK GENERATION FUNCTION
User’s Manual U12768EJ4V1UD
147
6.4.3
IDLE mode
(1) Settings and operating states
This mode stops the entire system except the watch timer by stopping the on-chip main clock supply while the
clock oscillator is still operating. Supply to the subclock continues. When this mode is released, there is no need
for the oscillator to wait for the oscillation stabilization time, so normal operation can be resumed quickly.
In IDLE mode, program execution is stopped and the contents of all registers and internal RAM are retained as
they were just before IDLE mode was set.
In addition, on-chip peripheral functions are stopped (except for
peripheral functions that are operating with the subclock).
External bus hold requests (HLDRQ) are not
acknowledged.
When the IDLE bit of the power save control register (PSC) is set to 1, the system switches to IDLE mode.
The operating statuses in IDLE mode are listed in Table 6-2.
(2) Release of IDLE mode
IDLE mode can be released by a non-maskable interrupt, an unmasked interrupt request output from an on-chip
peripheral I/O that can be operated, or RESET pin input.
Table 6-2. Operating Statuses in IDLE Mode (1/2)
IDLE Mode Settings
When Subclock Exists
When Subclock Does Not Exist
CPU
Stopped
Clock generator
Both main clock and subclock oscillator
Clock supply to CPU and on-chip peripheral functions is stopped
16-bit timer (TM0)
Operates when INTWTI is selected as count
clock (fXT is selected for watch timer)
Stopped
16-bit timer (TM1)
Stopped
8-bit timer (TM2)
Stopped
8-bit timer (TM3)
Stopped
8-bit timer (TM4)
Operates when fXT is selected for count clock
Stopped
8-bit timer (TM5)
Operates when fXT is selected for count clock
Stopped
Watch timer
Operates when fXT is selected for count clock
Stopped
Watchdog timer
Stopped
CSI0 to CSI2
Operates when an external clock is selected as the serial clock
I
2CNote
Stopped
Serial
interface
UART0,
UART1
Operates when an external clock is selected as the baud rate clock (transmit only)
A/D converter
Stopped
DMA0 to DMA2
Stopped
Real-time output
Operates when INTTM4 or INTTM5 is selected
(when TM4 or TM5 is operating)
Stopped
Note
Available only in the
PD703014AY, 703014BY, 703015AY, 703015BY, 703017AY, 70F3015BY, and
70F3017AY
Item