Samsung KS57C2308 manual Stop Idle, Cpu

POWER-DOWN KS57C2308/P2308/C2316/P2316

Table 8-1. Hardware Operation During Power-Down Modes

Mode	Main Stop	Sub Stop	Main/Sub Stop	Idle
System clock	Main clock (fx)	Sub clock (fxt)	Main clock (fx) (1)	Main (fx) or sub clock
				(fxt)
Instruction	STOP	Setting SCMOD.2 to	STOP	IDLE
		“1”
Clock oscillator	Main clock oscillation	Sub clock oscillation	Main clock oscillation	Only CPU clock
	stops	stops	stops	stops. (2)
Basic timer	Basic timer stops.	Basic timer stops.	Basic timer stops.	Basic timer operates.
Serial I/O	operates only if	operates only if	operates only if	operates only if a
interface	external SCK is	external SCK is	external SCK is	clock other than the
	selected as serial	selected as serial	selected as serial	CPU clock is selected
	clock	clock	clock	as the serial clock.
Timer/counter 0	Operates only if	Operates only if	Operates only if	Timer/counter 0
	TCL0 is selected as	TCL0 is selected as	TCL0 is selected as	operates.
	counter clock.	counter clock.	counter clock.
Watch timer	Operates only if sub	Watch timer stops.	Watch timer stops.	Watch timer
	clock (fxt) is selected			operates.
	as counter clock.
LCD controller	Operates only if sub	LCD controller stops.	LCD controller stops.	LCD controller
	clock (fxt) is selected			operates.
	as LCD clock,
	LCDCK.
External	INT1 and INT2 are	INT0, INT1, and INT2	INT1 and INT2 are	INT1 and INT2 are
interrupts	acknowledged; INT0	is not serviced.	acknowledged; INT0	acknowledged; INT0
	is not serviced.		is not serviced.	is not serviced.
CPU	All CPU operations are disabled.
Mode release	Interrupt request	Only RESET input	Interrupt request signals (except INT0)
signal	signals (except INT0)		pre-enabled by IEx or RESET input.
	pre-enabled by IEx or
	RESET input.

NOTES:

1.Sub clock stops by setting SCMOD.2 to “1”.

2.Main and sub clock oscillation continues.

8-2