45111 Datasheet, PDF (176/184 Pages) List of Unclassifed Manufacturers – 14-DAY MONEY BACK GUARANTEE

15 Appendix E: SX Data Sheet
In addition, the SX48/52 devices also allow interrupts on certain timer events, like overflow, compare
match, and input capture.
15.5.4 RB0-RB7 Interrupt
The SX offers eight sources of external interrupts; a change of state on any of RB0 – RB7 can generate an
interrupt. These can be individually configured via the WKEN_B and WKED_B configuration registers.
The latency, or response delay, will be five cycles in Turbo mode and ten cycles in Non-Turbo mode.
See “Wake-Up (Interrupt) on Edge Detect” in Chapter 10.2.5 for more information.
15.6 Peripherals
15.6.1 Oscillator Driver
The SX chips offer a configurable oscillator driver that supports five types of oscillators:
LP:
XT:
HS:
RC:
IRC:
Low Power Oscillator
Crystal or Resonator
High Speed Crystal or Resonator
Resistor/Capacitor (external)
Resistor/Capacitor (internal)
An external clock source can also be used to drive the OSC1 pin (leaving the OSC2 pin disconnected) as
in Figure 39 – SX with External Clock.
15.6.1.1 LP, XT and HS Mode
In XT, LP, and HS modes, a crystal or ceramic resonator can be connected to the SX chip as in Figure 37
- SX with External Crystal or in Figure 38 - SX with External Ceramic Resonator. The SX oscillator
driver design requires the use of a parallel cut crystal. Use of a series cut crystal may give a frequency
out of the crystal manufacturer’s specifications. The values of the components can be determined from
Table 34 – External Component Selection for Crystals, below. Please note that some ceramic resonators
have internal capacitors so that no external capacitors are required.
Figure 37 - SX with External Crystal
C1
XTL
C2
OSC1
Rp
SX
OSC2
Page 176 • SX-Key/Blitz Development System Manual 2.0 • Parallax, Inc.