122-32000 Parallax Inc, 122-32000 Datasheet - Page 29

• Manufacturer Part Number: 122-32000
• Description: MANUAL PROPELLER
• Manufacturer: Parallax Inc

Specifications of 122-32000

• Accessory Type: Manual
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: Propeller Education (PE) Kit
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

OSCMx
1
0
0
1
1
Bit
Bit
0
1
0
1
0
0
1
0
1
Effect
Disables the PLL circuit. The RCFAST and RCSLOW settings of the _CLKMODE
declaration configure PLLENA this way.
Enables the PLL circuit. Each of the PLLxx settings of the _CLKMODE declaration
configures PLLENA this way at compile time. The Clock PLL internally multiplies the
XIN pin frequency by 16. OSCENA must also be ‘1’ to propagate the XIN signal to the
Clock PLL. The Clock PLL's internal frequency must be kept within 64 MHz to 128 MHz
– this translates to an XIN frequency range of 4 MHz to 8 MHz. Allow 100 µs for the
Clock PLL to stabilize before switching to one of its outputs via the CLKSELx bits.
Once the Crystal Oscillator and Clock PLL circuits are enabled and stabilized, you can
switch freely among all clock sources by changing the CLKSELx bits.
Effect
Disables the Crystal Oscillator circuit. The RCFAST and RCSLOW settings of the
_CLKMODE declaration configure OSCENA this way.
Enables the Crystal Oscillator circuit so that a clock signal can be input to XIN, or so
that XIN and XOUT can function together as a feedback oscillator. The XINPUT and
XTALx settings of the _CLKMODE declaration configure OSCENA this way. The
OSCMx bits select the operating mode of the Crystal Oscillator circuit. Note that no
external resistors or capacitors are required for crystals and resonators. Allow a crystal
or resonator 10 ms to stabilize before switching to a Crystal Oscillator or Clock PLL
output via the CLKSELx bits. When enabling the Crystal Oscillator circuit, the Clock
PLL may be enabled at the same time so that they can share the stabilization period.
_CLKMODE
Setting
XINPUT
XTAL1
XTAL2
XTAL3
Resistance
Table 1-9: OSCMx (Bits 4:3)
2000 Ω
1000 Ω
XOUT
Infinite
500 Ω
Table 1-8: OSCENA (Bit 5)
Table 1-7: PLLENA (Bit 6)
6 pF (pad only)
36 pF
26 pF
16 pF
Capacitance
XIN/XOUT
DC to 128 MHz Input
4 to 16 MHz Crystal/Resonator
8 to 32 MHz Crystal/Resonator
20 to 60 MHz Crystal/Resonator
Propeller Manual v1.0 · Page 29
Frequency Range