ATMEGA256RZAV-8AU Atmel, ATMEGA256RZAV-8AU Datasheet - Page 68

• Manufacturer Part Number: ATMEGA256RZAV-8AU
• Description: MCU ATMEGA2561/AT86RF230 64-TQFP
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA256RZAV-8AU

• Frequency: 2.4GHz
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: ISM, ZigBee™
• Power - Output: 3dBm
• Sensitivity: -101dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 15.5mA
• Current - Transmitting: 16.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 256kB Flash, 4kB EEPROM, 8kB RAM
• Antenna Connector: PCB, Surface Mount
• Package / Case: 64-TQFP
• Wireless Frequency: 2.4 GHz
• Interface Type: JTAG, SPI
• Output Power: 3 dBm
• For Use With: ATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Data Rate - Maximum: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: ATmega256

9.6.3 External Reference Frequency Setup
9.6.4 Master Clock Signal Output (CLKM)
68
AT86RF230
Figure 9-4. Simplified XOSC Schematic with External Components
When using an external reference frequency, the signal needs to be connected to pin
XTAL1 as indicated in Figure 9-5 and the register XTAL_MODE of register 0x12
(XOSC_CTRL) need to be set to the external oscillator mode. The oscillation peak-to-
peak amplitude shall be 400 mV, but not larger than 500 mV.
Figure 9-5. Setup for Using an External Frequency Reference
The generated reference clock signal can be fed to a microcontroller using pin 17
(CLKM). The internal 16 MHz raw clock can be divided by an internal prescaler. Thus,
clock frequencies of 16 MHz, 8 MHz, 4 MHz, 2 MHz or 1 MHz can be supplied by
pin CLKM.
The CLKM frequency and pin driver strength is configurable using register
0x03 (TRX_CTRL_0). There are two possibilities to change the CLKM frequency. If
CLKM_SHA_SEL = 0, changing the register bits CLKM_CTRL (register 0x03,
TRX_CTRL_0)
(CLKM_SHA_SEL = 1) the new clock rate is supplied when leaving the SLEEP state
the next time.
XTAL_TRIM[3:0]
XTAL2
C
TRIM
XTAL2
immediately
C
PAR
EVDD
CX
16MHz
affects
XTAL1
16 MHz
AT86RF230
the
PCB
XTAL1
CX
CLKM
AT86RF230
C
XTAL_TRIM[3:0]
TRIM
C
PAR
PCB
clock
5131E-MCU Wireless-02/09
rate.
Otherwise