XE8000EV101 Semtech, XE8000EV101 Datasheet - Page 44

• Manufacturer Part Number: XE8000EV101
• Description: EVAL BOARD FOR XE8801AMI027LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV101

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC01AMI027
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

7.4 Interrupts and events map
7.5 Clock sources
7.5.1
7.5.1.1
The RC oscillator is always turned on and selected for CPU and system operation at power-on reset and when
exiting sleep mode. It can be turned off after the Xtal (quartz oscillator) has been started, after selection of the
external clock or by entering sleep mode.
The RC oscillator has two frequency ranges: sub-MHz (100 kHz to 1 MHz) and above-MHz (1 MHz to 10 MHz).
Inside a range, the frequency can be tuned by software for coarse and fine adjustment. See registers
RegSysRcTrim1 and RegSysRcTrim2.
Bit EnableRC in register RegSysClock controls the propagation of the RC clock signal and the operation of the
oscillator. The user can stop the RC oscillator by resetting the bit EnableRC. Entering the sleep mode disables the
RC oscillator.
Note: Before turning off the RC oscillator, the cpusel bit in RegSysClock must be set to one.
Note: The RC oscillator bias can be maintained while the oscillator is switched off by setting the bit BiasRc in
RegSysClock. This allows a faster restart of the RC oscillator at the cost of increased power consumption when
the oscillator is disabled (see section 7.5.1.3).
7.5.1.2
The RC oscillator frequency can be set using the bits in the RegSysRcTrim1 and RegSysRcTrim2 registers.
Figure 7-2 shows the nominal frequency of the RC oscillator as a function of these bits. The absolute value of the
frequency for a given register content may change by ±50% from chip to chip due to the tolerances on the
integrated capacitors and resistors. However, the modification of the frequency as a function of a modification of
the register content is fairly precise for frequencies below 2MHz. This means that the curves in Figure 7-2 can shift
up and down but that the slope remains unchanged.
The bit RcFreqRange modifies the oscillator frequency by a factor of 10. The upper curve in the figure
corresponds to RcFreqRange=1.
The RcFreqCoarse modifies the frequency of the oscillator by a factor (RcFreqCoarse+1). The figure represents
the frequency for 5 different values of the bits RcFreqCoarse: for each value the frequency is multiplied by 2.
Incrementing the RcFreqFine code increases the frequency by about 1.4%.
The frequency of the oscillator is therefor given by:
© Semtech 2005
IrqPre1
IrqPre2
Interrupt
RC oscillator
Configuration
RC oscillator frequency tuning
Ck128Hz
Ck1Hz
Interrupt source
Table 7-6: Interrupts and events map
Mapping in the interrupt manager
RegIrqMid(3)
RegIrqHig(6)
7-4
Mapping in the event manager
XE8801A – SX8801R
RegEvn(5)
RegEvn(1)
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