Samsung manual Oscillator CIRCUITSKS57C2308/P2308/C2316/P2316

OSCILLATOR CIRCUITSKS57C2308/P2308/C2316/P2316

Table 6-4. Main/Sub Oscillation Stop Mode

Mode	Condition	Method to issue Osc Stop	Osc Stop Release Source (2)
Main	Main oscillator runs.	STOP instruction:	Interrupt and reset:
Oscillation	Sub oscillator runs	Main oscillator stops.	After releasing stop mode, main
STOP Mode	(stops).	CPU is in idle mode.	oscillation starts and oscillation
	System clock is the	Sub oscillator still runs	stabilization time is elapsed. And then
	main oscillation clock.	(stops).	the CPU operates.
			Oscillation stabilization time is
			1 / {256 x BT clock (fx)}.
		(1)	Reset:
		Set SCMOD.3 to “1”
		Main oscillator stops, halting	Interrupt can’t start the main oscillation.
		the CPU operation.	Therefore, the CPU operation can never
		Sub oscillator still runs	be restarted.
		(stops).
	Main oscillator runs.	STOP instruction: (1)	BToverflow and reset:
	Sub oscillator runs.	Main oscillator stops.	After the overflow of basic timer [1 /
	System clock is the	CPU is in idle mode.	{256 x BT clock (fxt)}], CPU operation
	sub oscillation clock.	Sub oscillator still runs.	and main oscillation automatically start.
		Set SCMOD.3 to “1”	Set SCMOD.3 to “0” or reset
		Main oscillator stops.
		CPU still operates.
		Sub oscillator still runs.
Sub	Main oscillator runs.	Set SCMOD.2 to “1”	Set SCMOD.2 to “0” or reset
oscillation	Sub oscillator runs.	Main oscillator still runs.
STOP Mode	System clock is the	CPU operates.
	main oscillation clock.	Sub oscillator stops.
	Main oscillator runs	Set SCMOD.2 to “1”	Reset
	(stops).	Main oscillator still runs
	Sub oscillator runs.	(stops).
	System clock is the	Sub oscillator stops, halting
	sub oscillation clock.	the CPU operation.

NOTES:

1.This mode must not be used.

2.Oscillation stabilization time by interrupt is 1 / (256 x BT clocks). Oscillation stabilization time by a reset is 31.3 ms at 4.19 MHz, main oscillation clock.

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