User’s Manual U11969EJ3V0UM00
145
CHAPTER 6 CLOCK GENERATOR FUNCTION
6.5.4 IDLE mode
(1)
Entering and operation status
In this mode, both the CPU clock and the internal system clock are stopped to further reduce power
consumption. However, since the clock generator continues to run, normal operation can resume without
having to wait for the oscillator and PLL circuit to stabilize.
The IDLE mode is entered when the PSC register is programmed by the store (ST/SST) instruction or bit
manipulation (SET1/CLR1/NOT1) instruction.
Execution of the program is stopped in the IDLE mode, but the contents of the registers and internal RAM
immediately before entering the IDLE mode are retained. The on-chip peripheral functions are stopped in this
mode. External bus hold request (HLDRQ) is not accepted.
Table 6-3 shows the hardware status in the IDLE mode.
Table 6-3. Operating Status in IDLE Mode
Function
Operating Status
Clock Generator
Operates
Internal System Clock
Stops
CPU
Stops
I/O Port
Retained
Peripheral Function
Stops
Internal Data
Status of all internal data immediately before IDLE mode
is entered, such as CPU registers, status, data, and
internal RAM contents, are retained.
AD0 to AD15
High-impedance
A16 to A23
LBEN, UBEN
R/W
DSTB, WRL,
WRH, RD
ASTB
HLDAK
CLKOUT
Low level output
CLO
Retained
Note
Note Set the CLE bit of the CLOM register to 0 before switching over to the IDLE
mode.
External
Expansion
Mode
Содержание V854 UPD703006
Страница 2: ...2 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 22: ...22 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 80: ...80 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 134: ...134 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 156: ...156 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 294: ...294 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 320: ...320 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 324: ...324 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 336: ...336 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 376: ...376 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 382: ...382 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 394: ...394 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 396: ...396 User s Manual U11969EJ3V0UM00 MEMO ...