7 OSCILLATOR CIRCUIT (OSC)
56
EPSON
S1C17001 TECHNICAL MANUAL
7.2 OSC3 Oscillator Circuit
The OSC3 oscillator circuit generates the main clock (max. 8.2 MHz) for high-speed operation of the S1C17 core
and peripheral circuits. The oscillator circuit can be either crystal- or ceramic-based. It also supports external clock
input.
Oscillator circuit
control signal
Oscillator circuit
control signal
SLEEP control
SLEEP control
V
SS
OSC4
OSC3
C
D3
C
G3
X'tal3
or
Ceramic
OSC3
OSC4
OSC3
External
clock
N.C.
V
SS
LV
DD
OSC3
(1) Crystal/ceramic oscillator circuit
(2) External clock input
R
f
R
d
Figure 7.2.1 illustrates the OSC3 oscillator circuit configuration.
When used as a crystal or ceramic oscillator circuit, a crystal oscillator (X’tal3) or ceramic oscillator (Ceramic)
and feedback resistor (R
f
) should be connected between the OSC3 and OSC4 pins. Two capacitors (C
G3
and C
D3
)
should also be connected between the OSC3/OSC4 pins and V
SS
. A drain resistor (R
d
) should be connected between
the OSC4 pin and C
D3
, if required.
When used with external clock input, the OSC4 pin should be left free, and a clock with a duty ratio of 50% at
LV
DD
level should be input to the OSC3 pin.
OSC3 oscillation on/off
The OSC3 oscillator circuit stops oscillating if OSC3EN (D0/OSC_CTL register) is set to 0 and starts oscillat-
ing if set to 1. The OSC3 oscillator circuit stops oscillating even in SLEEP mode.
∗
OSC3EN
: OSC3 Enable Bit in the Oscillation Control (OSC_CTL) Register (D0/0x5061)
After initial resetting, OSC3EN is set to 1 and the OSC3 oscillator circuit is on. Since the OSC3 clock is used
as the system clock, the S1C17 core begins operating using the OSC3 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 ...
Страница 241: ...18 UART 232 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 277: ...20 I2 C 268 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 297: ...21 REMOTE CONTROLLER REMC 288 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 303: ...22 ON CHIP DEBUGGER DBG 294 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...
Страница 313: ...25 PACKAGE 304 EPSON S1C17001 TECHNICAL MANUAL This page intentionally left blank ...