
CHAPTER 22 STANDBY FUNCTION
User’s Manual U17473EJ2V0UD
548
Table 22-3. Operating Statuses in STOP Mode
When STOP Instruction Is Executed While CPU Is Operating on Main System Clock
STOP Mode Setting
Item
When CPU Is Operating on
Internal High-Speed
Oscillation Clock (fRH)
When CPU Is Operating on
X1 Clock (fX)
When CPU Is Operating on
External Main System Clock
(fEXCLK)
System clock
Clock supply to the CPU is stopped
fRH
fX
Stopped
Main system clock
fEXCLK
Input invalid
fXT
Status before STOP mode was set is retained
Subsystem clock
fEXCLKS
Operates or stops by external clock input
fRL
Status before STOP mode was set is retained
CPU
Operation stopped
Flash memory
Operation stopped
RAM
Status before STOP mode was set is retained
Port (latch)
Status before STOP mode was set is retained
00
16-bit timer/event
counter
01
Note
Operation stopped
50
Operable only when TI50 is selected as the count clock
8-bit timer/event
counter
51
Operable only when TI51 is selected as the count clock
H0
Operable only when TM50 output is selected as the count clock during 8-bit timer/event counter
50 operation
8-bit timer
H1
Operable only when fRL, fRL/2
7, or fRL/29 is selected as the count clock
Watch timer
Operable only when subsystem clock is selected as the count clock
Watchdog timer
Operable. Clock supply to watchdog timer stops when “internal low-speed oscillator can be
stopped by software” is set by option byte.
Clock output
Operable only when subsystem clock is selected as the count clock
A/D converter
Operation stopped
UART0
UART6
Operable only when TM50 output is selected as the serial clock during 8-bit timer/event counter
50 operation
CSI10
CSI11
Note
Operable only when external clock is selected as the serial clock
Serial interface
IIC0
Operation stopped
LCD controller/driver
Operable only when subsystem clock is selected as the count clock
Multiplier/divider
Note
Operation stopped
Power-on-clear function
Low-voltage detection function
External interrupt
Operable
Note
μPD78F0394, 78F0395, 78F0396, 78F0397, and 78F0397D only.
(Cautions are listed on the next page.)
Remark
fRH:
Internal high-speed oscillation clock
fX:
X1 clock
fEXCLK:
External main system clock
fXT:
XT1 clock
fEXCLKS: External subsystem clock
fRL:
Internal low-speed oscillation clock