Samsung KS57C2308 manual Timing for Oscillation Stabilization After Reset

KS57C2308/P2308/C2316/P2316 RESET

9 RESET

OVERVIEW

When a RESET signal is input during normal operation or power-down mode, a hardware reset operation is initiated and the CPU enters idle mode. Then, when the standard oscillation stabilization interval of 31.3 ms at 4.19 MHz has elapsed, normal system operation resumes.

Regardless of when the RESET occurs — during normal operating mode or during a power-down mode — most hardware register values are set to the reset values described in Table 9-1. The current status of several register values is, however, always retained when a RESET occurs during idle or stop mode; If a RESET occurs during normal operating mode, their values are undefined. Current values that are retained in this case are as follows:

—Carry flag

—Data memory values

—General-purpose registers E, A, L, H, X, W, Z, and Y

	OSCILLATION
	STABILIZATION
	(31.3 ms / 4.19 MHz)
RESET
INPUT
NORMAL MODE	IDLE MODE	OPERATING MODE
OR
POWER-DOWN
MODE
RESET	OPERATION

Figure 9-1. Timing for Oscillation Stabilization After RESET

9-1