AT86RF230_09 ATMEL [ATMEL Corporation], AT86RF230_09 Datasheet - Page 70

• Manufacturer Part Number: AT86RF230_09
• Description: Low Power 2.4 GHz Transceiver for ZigBee, IEEE 802.15.4, 6LoWPAN, RF4CE and ISM
• Manufacturer: ATMEL [ATMEL Corporation]

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AT86RF230
Bit
0x12
Read/Write
Initial value
Bit
0x12
Read/Write
Initial value
• Bit [2:0] – CLKM_CTRL
The register bits CLKM_CTRL set clock rate of pin CLKM.
Table 9-11. Clock Rate at Pin CLKM
Register 0x12 (XOSC_CTRL)
The register XOSC_CTRL controls the operation of the crystal oscillator.
• Bit [7:4] – XTAL_MODE
The register bit XTAL_MODE sets the operating mode of the crystal oscillator.
Table 9-12. Crystal Oscillator Operating Mode
• Bit [3:0] – XTAL_TRIM
The register bits XTAL_TRIM control two internal capacitance arrays connected to pins
XTAL1 and XTAL2. A capacitance value in the range from 0 pF to 4.5 pF is selectable
with a resolution of 0.3 pF.
Table 9-13. Crystal Oscillator Trimming Capacitors
Register Bit
Register Bit
CLKM_CTRL
Register Bit
XTAL_MODE
Register Bit
XTAL_TRIM
R/W
R/W
7
1
3
0
Value
0x0
0x4
0xF
Value
Value
Value
0x0
1
0
1
2
3
4
5
6
7
R/W
R/W
6
1
2
0
XTAL_MODE
XTAL_TRIM
Description
CLKM clock rate changes after SLEEP cycle
Description
No clock, pin set to logic low
1 MHz
2 MHz
4 MHz
8 MHz
16 MHz
Reserved
Reserved
Description
Crystal oscillator disabled, no clock signal is fed to the
internal circuitry.
Internal crystal oscillator disabled, use external
reference frequency
Internal crystal oscillator enabled
Description
0.0 pF, trimming capacitors disconnected
R/W
R/W
5
1
1
0
R/W
R/W
4
1
0
0
5131E-MCU Wireless-02/09
XOSC_CTRL
XOSC_CTRL