ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 250

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 3.5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.5mA
• Current - Transmitting: 14.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 4kB EEPROM, 16kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN, Exposed Pad
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 16 KB
• Interface Type: JTAG
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 6
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVR128RFA1-EK1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18.3.1 Reusing the Temporary High Byte Register
18.4 Timer/Counter Clock Sources
18.5 Counter Unit
250
ATmega128RFA1
If writing to more than one 16-bit register where the high byte is the same for all
registers written, then the high byte only needs to be written once. However note that
the same rule of atomic operation described previously also applies in this case.
The Timer/Counter can be clocked by an internal or an external clock source. The clock
source is selected by the Clock Select logic which is controlled by the Clock Select
(CSn2:0) bits located in the Timer/Counter control Register B (TCCRnB). For details on
clock sources and prescaler, see
305.
The main part of the 16-bit Timer/Counter is the programmable 16-bit bi-directional
counter unit. The following figure shows a block diagram of the counter and its
surroundings.
Figure 18-2. Counter Unit Block Diagram
Signal description (internal signals):
C Code Examples
Notes:
Count
Direction
void TIM16_WriteTCNTn( unsigned int i )
{
}
TCNTnH (8-bit)
TEMP (8-bit)
unsigned char sreg;
unsigned int i;
/* Save global interrupt flag */
sreg = SREG;
/* Disable interrupts */
__disable_interrupt();
/* Set TCNTn to i */
TCNTn = i;
/* Restore global interrupt flag */
SREG = sreg;
TCNTn (16-bit Counter)
1. See
DATA BUS
"About Code Examples" on page 8
(1)
Increment or decrement TCNTn by 1;
Select between increment and decrement;
TCNTnL (8-bit)
(8-bit)
"Timer/Counter 0, 1, 3, 4, and 5 Prescaler" on page
Direction
Count
Clear
Control Logic
TOP
.
BOTTOM
TOVn
(Int.Req.)
clk
Tn
Clock Select
( From Prescaler )
Detector
Edge
8266B-MCU Wireless-03/11
Tn