7 OSCILLATOR CIRCUIT (OSC)
66
EPSON
S1C17001 TECHNICAL MANUAL
0x5061: Oscillation Control Register (OSC_CTL)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
Oscillation
Control Register
(OSC_CTL)
0x5061
(8 bits)
D7–6
–
reserved
–
–
–
0 when being read.
D5–4
OSC3WT[1:0]
OSC3 wait cycle select
OSC3WT[1:0]
Wait cycle
0x0
R/W
0x3
0x2
0x1
0x0
128 cycles
256 cycles
512 cycles
1024 cycles
D3–2
–
reserved
–
–
–
0 when being read.
D1
OSC1EN
OSC1 enable
1 Enable
0 Disable
1
R/W
D0
OSC3EN
OSC3 enable
1 Enable
0 Disable
1
R/W
D[7:6] Reserved
D[5:4]
OSC3WT[1:0]: OSC3 Wait Cycle Select Bits
An oscillation stabilization wait timer is set to prevent malfunctions due to unstable clock operation at
the start of OSC3 oscillation.
The OSC3 clock is not fed to the system immediately after OSC3 oscillation starts—for example, when
power is first turned on, on awaking from SLEEP, or when the OSC3 oscillation circuit is turned on via
software—until the time set here has elapsed.
Table 7.8.2: OSC3 oscillation stabilization wait time settings
OSC3WT[1:0]
Oscillation stabilization
wait time
0x3
128 cycles
0x2
256 cycles
0x1
512 cycles
0x0
1,024 cycles
(Default: 0x0)
This is set to 1,024 cycles (OSC3 clock) after initial resetting. The CPU does not begin operating im-
mediately after resetting until this time has elapsed.
Note: The OSC3 oscillation start time depends on the oscillator and externally connected compo-
nents. The time should be set with an adequate oscillation stabilization wait time. Refer to the
typical oscillation start times specified in “24 Electrical Characteristics.”
D1
OSC1EN: OSC1 Enable Bit
Permits or prohibits OSC1 oscillator circuit operation.
1 (R/W): Permitted (on) (default)
0 (R/W): Prohibited (off)
Note: • The OSC1 oscillator circuit cannot be stopped if the OSC1 clock is being used as the sys-
tem clock.
• The OSC1 clock is not fed to the system for 256 cycles to prevent malfunctions immedi-
ately after OSC1 oscillation is started by changing the OSC1EN setting from 0 to 1.
D0
OSC3EN: OSC3 Enable Bit
Permits or prohibits OSC3 oscillator circuit operation.
1 (R/W): Permitted (on) (default)
0 (R/W): Prohibited (off)
Note: The OSC3 oscillator circuit cannot be stopped if the OSC3 clock is being used as the system
clock.
Содержание S1C17001
Страница 1: ...Technical Manual S1C17001 CMOS 16 BIT SINGLE CHIP MICROCONTROLLER ...
Страница 31: ...3 MEMORY MAP AND BUS CONTROL 22 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 33: ...4 POWER SUPPLY VOLTAGE 24 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 63: ...6 INITERRUPT CONTROLLER 54 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 87: ...8 CLOCK GENERATOR CLG 78 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 91: ...9 PRESCALER PSC 82 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 133: ...11 16 BIT TIMER T16 124 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 185: ...14 8 BIT OSC1 TIMER T8OSC1 176 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 211: ...16 STOPWATCH TIMER SWT 202 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 219: ...17 WATCHDOG TIMER WDT 210 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
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