RL78/G1P
CHAPTER 16 STANDBY FUNCTION
R01UH0895EJ0100 Rev.1.00
597
Nov 29, 2019
Table 16-1. Operating Statuses in HALT Mode
HALT Mode Setting
Item
When HALT 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
Operation continues (cannot
be stopped)
Operation disabled
f
X
Operation
disabled
Operation continues (cannot
be stopped)
Cannot operate
f
EX
Cannot
operate
Operation continues (cannot
be stopped)
f
IL
Set by bits 0 (WDSTBYON) and 4 (WDTON) of option byte (000C0H)
CPU Operation
stopped
Code flash memory
Operation stopped
Data flash memory
RAM
Port (latch)
Status before HALT mode was set is retained
Timer array unit
Operable
Watchdog timer
See
CHAPTER 8 WATCHDOG TIMER
Clock output/buzzer output
Operable
A/D converter
D/A converter
Serial array unit (SAU)
Serial interface (IICA)
DMA controller
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
General-purpose
CRC
In the calculation of the RAM area, operable when DMA is executed only
RAM parity error detection
function
Operable when DMA is executed only
RAM guard function
SFR guard function
Illegal-memory access
detection function
Remark
Operation
stopped:
Operation is automatically stopped before switching to the HALT mode.
Operation disabled: Operation is stopped before switching to the HALT mode.
f
IH
: High-speed on-chip oscillator clock
f
EX
: External main system clock
f
IL
: Low-speed on-chip oscillator clock
f
X
: X1
clock