ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 14

• 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

7.6.2 SPL – Stack Pointer Low
7.6.3 RAMPZ – Extended Z-pointer Register for ELPM/SPM
14
ATmega128RFA1
The AVR Stack Pointer is implemented as two 8-bit registers SPL and SPH in the I/O
space. The number of bits actually used is implementation dependent. Note that the
data space in some implementations of the AVR architecture is so small that only SPL
is needed. In this case, the SPH Register will not be present.
• Bit 7:0 – SP7:0 - Stack Pointer Low Byte
For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL.
Note that LPM is not affected by the RAMPZ setting.
• Bit 7:2 – Res5:0 - Reserved
For compatibility with future devices, be sure to write these bits to zero.
• Bit 1:0 – RAMPZ1:0 - Extended Z-Pointer Value
These two bits represent the MSB's of the Z-Pointer.
Table 7-2 RAMPZ Register Bits
For ELPM/SPM instructions, the Z-pointer is a concatenation of RAMPZ, ZH, and ZL,
as shown in
Figure 7-3. The Z-pointer used by ELPM and SPM
The actual number of bits is implementation dependent. Unused bits in an
implementation will always read as zero. For compatibility with future devices, be sure
to write these bits to zero.
Bit
$3D ($5D)
Read/Write
Initial Value
Bit
$3B ($5B)
Read/Write
Initial Value
Register Bits
RAMPZ1:0
Figure 7-3
Res5
SP7
RW
RW
7
1
7
0
Res4
SP6
RW
RW
6
1
6
0
below. Note that LPM is not affected by the RAMPZ setting.
Res3
SP5
RW
RW
5
1
5
0
Value
0
Res2
RW
SP4
RW
4
0
4
1
Description
Default value of Z-pointer MSB's.
Res1
RW
SP3
RW
3
0
3
1
Res0
SP2
RW
RW
2
1
2
0
RAMPZ1 RAMPZ0
RW
SP1
RW
1
0
1
1
8266A-MCU Wireless-12/09
SP0
RW
RW
0
1
0
0
RAMPZ
SPL