User’s Manual U11969EJ3V0UM00
147
CHAPTER 6 CLOCK GENERATOR FUNCTION
External
Expansion
Mode
6.5.5 Software STOP mode
(1)
Entering and operation status
In this mode, the CPU clock, the internal system clock, and the clock generator are stopped, reducing power
consumption to only leakage current. In this state, power consumption is minimized.
The software STOP mode is entered by programming the PSC register (Specific register) using the store (ST/
SST) or bit manipulation (SET1/CLR1/NOT1) instruction (refer to 3.4.9 Specific register).
It is necessary to ensure the oscillation stabilization time of the oscillator circuit after the software STOP mode
has been released, when the oscillator connection mode (CESEL bit = “0”) are set.
In the software STOP mode, program execution is stopped, but all the contents of the registers and internal
RAM immediately before entering the STOP mode are retained. The on-chip peripheral function also stops
operation.
Table 6-4 shows the hardware status in the software STOP mode.
Table 6-4. Operating Status in Software STOP Mode
Function
Operating Status
Clock Generator
Stops
Internal System Clock
Stops
CPU
Stops
I/O Port
Note 1
Retained
Peripheral Function
Stops
Internal Data
Note 1
Status of all internal data immediately before software
STOP mode is set, 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 2
Notes 1. When the value of V
DD
is within the operating range.
Even if V
DD
drops below the minimum operating voltage, the contents
of the internal RAM can be retained if the data retention voltage V
DDDR
is maintained.
2. Set the CLE bit of the CLOM register to 0 before switching over to the
software STOP mode.
Содержание V854 UPD703006
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