ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 290

• 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

18.11.36 OCR4AH – Timer/Counter4 Output Compare Register A High Byte
18.11.37 OCR4AL – Timer/Counter4 Output Compare Register A Low Byte
290
ATmega128RFA1
The two Timer/Counter I/O locations (TCNT4H and TCNT4L, combined TCNT4) give
direct access, both for read and for write operations, to the Timer/Counter unit 16-bit
counter. To ensure that both the high and low bytes are read and written simultaneously
when the CPU accesses these registers, the access is performed using an 8-bit
temporary High Byte Register (TEMP). This temporary register is shared by all the other
16-bit registers. See section "Accessing 16-bit Registers" for details. Modifying the
counter (TCNT4) while the counter is running introduces a risk of missing a compare
match between TCNT4 and one of the OCR4x Registers. Writing to the TCNT4
Register blocks (removes) the compare match on the following timer clock for all
compare units.
• Bit 7:0 – TCNT4L7:0 - Timer/Counter4 Low Byte
The Output Compare Registers contain a 16-bit value that is continuously compared
with the counter value (TCNT4). A match can be used to generate an Output Compare
interrupt. The Output Compare Registers are 16-bit in size. To ensure that both the high
and low bytes are written simultaneously when the CPU writes to these registers, the
access is performed using an 8-bit temporary High Byte Register (TEMP). This
temporary register is shared by all the other 16-bit registers. See section "Accessing 16-
bit Registers" for details.
• Bit 7:0 – OCR4AH7:0 - Timer/Counter4 Output Compare Register High Byte
The Output Compare Registers contain a 16-bit value that is continuously compared
with the counter value (TCNT4). A match can be used to generate an Output Compare
interrupt. The Output Compare Registers are 16-bit in size. To ensure that both the high
and low bytes are written simultaneously when the CPU writes to these registers, the
access is performed using an 8-bit temporary High Byte Register (TEMP). This
temporary register is shared by all the other 16-bit registers. See section "Accessing 16-
bit Registers" for details.
• Bit 7:0 – OCR4AL7:0 - Timer/Counter4 Output Compare Register Low Byte
Bit
NA ($A9)
Read/Write
Initial Value
Bit
NA ($A8)
Read/Write
Initial Value
RW
RW
7
0
7
0
RW
RW
6
0
6
0
RW
RW
5
0
5
0
RW
RW
OCR4AH7:0
OCR4AL7:0
4
0
4
0
RW
RW
3
0
3
0
RW
RW
2
0
2
0
RW
RW
1
0
1
0
RW
RW
0
0
0
0
8266A-MCU Wireless-12/09
OCR4AH
OCR4AL