RL78/G1P
CHAPTER 16 STANDBY FUNCTION
R01UH0895EJ0100 Rev.1.00
601
Nov 29, 2019
Table 16-2. Operating Statuses in STOP Mode
STOP Mode Setting
Item
When STOP Instruction Is Executed While CPU Is Operating on Main System Clock
When CPU Is Operating on
High-speed On-chip Oscillator
Clock (f
IH
)
When CPU Is Operating on
X1 Clock (f
X
)
When CPU Is Operating on
External Main System Clock
(f
EX
)
System clock
Clock supply to the CPU is stopped
Main system clock f
IH
Stopped
f
X
f
EX
f
IL
Set by bits 0 (WDSTBYON) and 4 (WDTON) of option byte (000C0H)
CPU Operation
stopped
Code flash memory
Data flash memory
Operation stopped
RAM Operation
stopped
Port (latch)
Status before STOP mode was set is retained
Timer array unit
Operation disabled
Watchdog timer
See
CHAPTER 8 WATCHDOG TIMER
Clock output/buzzer output
Operation stopped
A/D converter
Wakeup operation is enabled (switching to the SNOOZE mode)
D/A converter
Operable (status before STOP mode was set is retained)
Serial array unit (SAU)
Wakeup operation is enabled only for CSIp and UARTq (switching to the SNOOZE mode)
Operation is disabled for anything other than CSIp and UARTq
Serial interface (IICA)
Wakeup by address match operable
DMA controller
Operation disabled
Event link controller (ELC)
Operable function blocks can be linked
Power-on-reset function
Operable
Voltage detection function
External interrupt
CRC
operation
function
High-speed CRC
Operation stopped
General-purpose
CRC
RAM parity error detection
function
RAM guard function
SFR guard function
Illegal-memory access
detection function
(
Remarks
are listed on the next page.)
Cautions 1. To use the peripheral hardware that stops operation in the STOP mode, and the peripheral hardware
for which the clock that stops oscillating in the STOP mode after the STOP mode is released, restart
the peripheral hardware.
2. To stop the low-speed on-chip oscillator clock in the STOP mode, must previously be set an option
byte to stop the watchdog timer operation in the HALT/STOP mode (bit 0 (WDSTBYON) of 000C0H =
0).
3. To shorten oscillation stabilization time after the STOP mode is released when the CPU operates
with the high-speed system clock (X1 oscillation), temporarily switch the CPU clock to the high-
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