CHAPTER 8 CLOCK GENERATOR FUNCTIONS
User’s Manual U12688EJ4V0UM00
242
8.5.5 Software STOP mode
(1) Settings and operating state
In this mode, the clock generator (oscillator and PLL synthesizer) is stopped. The system overall is stopped,
and it enters an ultra-low power consumption state where only device leakage current is lost.
It is possible to enter the software STOP mode by setting the PSC register (specific register) using a store
instruction (ST/SST instruction) or a bit manipulation instruction (SET1/CLR1/NOT1 instruction) in software
(refer to 3.4.9 Specific registers).
In the case of the PLL mode and oscillator connection mode (CESEL bit of the PSC register = 0), it is
necessary to secure the oscillation stabilization of the oscillator after releasing the software STOP mode.
In the software STOP mode, program execution stops, but all the contents of all the registers, internal RAM,
and ports are held in the state they were in just before entering the software STOP mode. Operation of the
internal peripheral I/O (except the ports) is also stopped.
The status of each hardware unit during the software STOP mode is as shown in Table 8-5.
Caution In the case of the direct mode (CKSEL pin = 1) or external clock connection mode (CESEL bit
of the PSC register = 1), the software STOP mode cannot be used.
Table 8-5. Operating States When in Software STOP Mode
Function
Operating State
Clock generator
Stop
Internal system clock
Stop
CPU
Stop
Port
Note
Hold
Internal peripheral I/O (except ports)
Stop
Internal data
Note
All the CPU’s registers, status, data, internal RAM contents,
other internal data, etc. are retained in the state they were
in before entering the HALT mode.
D0 to D15
A0 to A23
RD, WE, OE, BCYST
High-impedance
LWR, UWR, IORD, IOWR
CS0 to CS7
High-level output
RAS0 to RAS7
LCAS, UCAS
REFRQ
Operating
HLDRQ
Input (no sampling)
HLDAK
High-impedance
When in external
expansion mode
WAIT
Input (no sampling)
CLKOUT
Low-level output
Note If the V
DD
value is within the operable range.
However, even when it drops below the minimum operable voltage, if the data hold voltage V
DDDR
is
maintained, the contents of internal RAM only are held.
Summary of Contents for V850E/MS1 UPD703100
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