7 OSCILLATOR (OSC)
S1C17704 TECHNICAL MANUAL
EPSON
7-13
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
Sets the stable oscillation wait time to avoid malfunctions caused by the unstable clock when the OSC3
starts oscillating.
The OSC3 clock is not supplied to the system until the wait time set here has elapsed after the OSC3
starts oscillating such as at power on, at wakeup from SLEEP status, or when the OSC3 oscillator is
turned on with software.
Table 7.9.2 Setting the Stable OSC3 Oscillation Wait Time
OSC3WT[1:0]
Stable oscillation wait time
0x3
128 cycles
0x2
256 cycles
0x1
512 cycles
0x0
1024 cycles
(Default: 0x0)
At initial reset, the oscillation stabilization wait time is set to 1024 cycles (OSC3 clock). The CPU does
not start operating until the set time has elapsed after the reset state is canceled.
Note
: The oscillation start time will vary somewhat depending on the resonator and externally
attached parts. Set the oscillation stabilization wait time allowing an adequate margin. For the
oscillation start time, see an example indicated in Chapter 26, “Electrical Characteristics.”
D[3:2] Reserved
D1
OSC1EN: OSC1 Enable Bit
Enables/disables the OSC1 oscillator.
1 (R/W): Enable (On) (default)
0
(R/W):
Disable
(Off)
Notes
: • The OSC1 oscillator cannot be disabled when OSC1 is used as the system clock.
• In order to avoid malfunctions, the OSC1 clock will not be supplied to the system for 256
OSC1 clock-cycle period when the OSC1 oscillation is started by setting OSC1EN from 0 to 1.
D0
OSC3EN: OSC3 Enable Bit
Enables/disables the OSC3 oscillator.
1 (R/W): Enable (On) (default)
0
(R/W):
Disable
(Off)
Note
: The OSC3 oscillator cannot be disabled when OSC3 is used as the system clock.
Содержание S1C17704
Страница 1: ...TECHNICAL MANUAL S1C17704 CMOS 16 BIT SINGLE CHIP MICROCOMPUTER ...
Страница 22: ...1 OVERVIEW 1 10 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 42: ...3 MEMORY MAP BUS CONTROL 3 12 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 82: ...6 INTERRUPT CONTROLLER ITC 6 26 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 108: ...8 CLOCK GENERATOR CLG 8 8 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 112: ...9 PRESCALER PSC 9 4 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 138: ...10 I O PORTS P 10 26 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 156: ...11 16 BIT TIMERS T16 11 18 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 208: ...14 8 BIT OSC1 TIMER T8OSC1 14 16 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 234: ...16 STOPWATCH TIMER SWT 16 14 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 242: ...17 WATCHDOG TIMER WDT 17 8 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 264: ...18 UART 18 22 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 300: ...20 I2C 20 20 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 320: ...21 REMOTE CONTROLLER REMC 21 20 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 360: ...24 ON CHIP DEBUGGER DBG 24 6 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...
Страница 362: ...25 BASIC EXTERNAL WIRING DIAGRAM 25 2 EPSON S1C17704 TECHNICAL MANUAL THIS PAGE IS BLANK ...