Samsung S5PC100 User Manual page 256

S5PC100 USER'S MANUAL (REV1.0)
10.2.2 Oscillation Pad Stable Counter (OSC_STABLE, R/W, Address = 0xE010_8104)
OSC_STABLE
Reserved
OSC_CNT_VALUE
If main oscillation pad (XXTI) is enabled from disabled state, it takes some amount of time for the pad to generate
stable clock. OSC_STABLE register is applied to wait for this oscillation stabilization time when OSC_EN[0] of
STOP_CFG is 1'b0 in STOP and DEEP-STOP mode.
Oscillation stabilization time is calculated as follows :
Oscillation stabilization time = OSC_Stabilization_Counter_Value x Ocillator_period (XTI)
where OSC_Stabilizaton_Counter_Value can be set by two ways as below :
you can select one by using STABLE_COUNTER TYPE[23] in OTHERS register.
1) Exponential Scale : The cycle value mapped by OSC_CNT_VALUE[3:0] is used.
e.g., if OSC_CNT_VALUE[3:0] = 0x1, then OSC_Stabilization_Counter_Value = 2
2) Set by SFR : OSC_Stabilization_Coutner_Value = OSC_CNT_VALUE[19:4]. And OSC_CNT_VALUE[3:0]
should be kept as the reset value.
Bit
[31:20] Reserved
Mapping to counter value 19 to 4 when STABLE COUNTER
[19:4] Type is 1 (OSC_CNT_VALUE[3:0] should stay at reset
values)
Oscillation pad stable counter value (Exponential Scale)
Value
0x0
[3:0] 0x2
0x4
0x6
0x8
Description
Cycles Value
4
2 0x1
10
2 0x3
12
2 0x5
14
2 0x7
16
2 Others
Power Management
Reset Value
0x0
Cycles
9
2
11
2 0x1
13
2
15
2
4
2
9
(512).
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