![](http://datasheet.mmic.net.cn/100000/IF180C52TXXX-20R_datasheet_3493957/IF180C52TXXX-20R_186.png)
186
32099I–01/2012
AT32UC3L016/32/64
13. System Control Interface (SCIF)
Rev: 1.0.2.2
13.1
Features
Supports crystal oscillator 0.45-16MHz (OSC0)
Supports Digital Frequency Locked Loop 40-150MHz (DFLL)
Supports 32KHz ultra-low-power oscillator (OSC32K)
Supports 32kHz RC oscillator (RC32K)
Integrated low-power RC oscillator (RCSYS)
Generic clocks (GCLK) with wide frequency range provided
Controls Brown-out detectors (BOD) and supply monitors
Controls Bandgap
Controls Voltage Regulator (VREG) behavior and calibration
Controls Temperature Sensor
Controls Supply Monitor 33 (SM33) operating modes and calibration
Controls 120MHz integrated RC Oscillator (RC120M)
Four 32-bit general-purpose backup registers
13.2
Overview
The System Control Interface (SCIF) controls the oscillators, Generic Clocks, BODs, Bandgap,
VREG, Temperature Sensor, and Backup Registers.
13.3
I/O Lines Description
13.4
Product Dependencies
In order to use this module, other parts of the system must be configured correctly, as described
below.
13.4.1
I/O Lines
The SCIF provides a number of generic clock outputs, which can be connected to output pins,
multiplexed with GPIO lines. The programmer must first program the GPIO controller to assign
these pins to their peripheral function. If the I/O pins of the SCIF are not used by the application,
they can be used for other purposes by the GPIO controller. Oscillator pins are also multiplexed
Table 13-1.
I/O Lines Description
Pin Name
Pin Description
Type
RC32OUT
RC32 output at start-up
Output
XIN0
Crystal 0 input
Analog/Digital
XIN32
Crystal 32 input (primary location)
Analog/Digital
XIN32_2
Crystal 32 input (secondary location)
Analog/Digital
XOUT0
Crystal 0 output
Analog
XOUT32
Crystal 32 output (primary location)
Analog
XOUT32_2
Crystal 32 output (secondary location)
Analog
GCLK4-GCLK0
Generic clock output
Output