CHAPTER 8 CLOCK GENERATOR FUNCTIONS
User’s Manual U12688EJ4V0UM00
240
8.5.4 IDLE mode
(1) Settings and operating state
In this mode, the clock generator (oscillator and PLL synthesizer) continues to operate, but supply of the
internal system clock is stopped, which causes the system overall to stop.
When releasing the system from the IDLE mode, it is not necessary to secure the oscillation stabilization time
of the oscillator, so it is possible to switch to normal operation at high speed.
The IDLE mode is entered by the setting of the PSC register (specific register), set through a store instruction
(ST/SST instruction) or a bit operation instruction (SET1/CLR1/NOT1 instruction) (refer to 3.4.9 Specific
registers).
In the IDLE mode, program execution is stopped, but all the contents of all the registers, internal RAM, and
ports are held. Operation of the internal peripheral I/O (except the ports) is also stopped.
The state of each hardware unit when in IDLE mode is as shown in Table 8-4.
Table 8-4. Operating States When in IDLE Mode
Function
Operating State
Clock generator
Operating
Internal system clock
Stop
CPU
Stop
Port
Hold
Internal peripheral I/O (except ports)
Stop
Internal data
All the CPU’s registers, status, data, internal RAM contents
and 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
Содержание V850E/MS1 UPD703100
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