ATMEGA256RFR2_14 Datasheet, PDF (206/611 Pages) ATMEL Corporation – Microcontroller with Low Power

• Bit 4:0 – LLDRH4:0 - High-Byte Data Register Bits
Value of the high-byte calibration result
Table 12-113 LLDRH Register Bits
Register Bits
Value
Description
LLDRH4:0
0x00
0x10
Calibration limit for fast process corner/high
output voltage
Calibration limit for slow process corner/low
output voltage
12.6.12 LLDRL – Low Leakage Voltage Regulator Data Register (Low-Byte)
Bit
7
6
5
4
3
2
1
0
NA ($130)
Read/Write
Initial Value
Res3
R
0
Res2
R
0
Res1
R
0
Res0
R
0
LLDRL3 LLDRL2 LLDRL1 LLDRL0
RW
RW
RW
RW
0
0
0
0
LLDRL
The low-byte of the calibration data can be accessed through this register. Write access
is only enabled when the bit LLENCAL of the LLCR register is 0. Then the data bits
LLDRL3:0 directly control the output voltage of the low-leakage voltage regulator.
Higher numbers generate lower voltages. The contents of this register is meaningless
when the bit LLSHORT of the LLCR register is 1. If the bit LLENCAL is 1 then the
results of the automatic calibration are stored.
• Bit 7:4 – Res3:0 - Reserved
These bits are reserved for future use.
• Bit 3:0 – LLDRL3:0 - Low-Byte Data Register Bits
Value of the low-byte calibration result
Table 12-114 LLDRL Register Bits
Register Bits
Value
Description
LLDRL3:0
0x00
0x08
Calibration limit for fast process corner/high
output voltage
Calibration limit for slow process corner/low
output voltage
12.6.13 DPDS0 – Port Driver Strength Register 0
Bit
7
6
5
4
3
2
1
0
NA ($136)
Read/Write
Initial Value
PFDRV1 PFDRV0 PEDRV1 PEDRV0 PDDRV1 PDDRV0 PBDRV1 PBDRV0
RW
RW
RW
RW
RW
RW
RW
RW
0
0
0
0
0
0
0
0
DPDS0
The output driver strength can be set individually for each digital I/O port. The following
tables show output current levels for a typical supply voltage of DEVDD = 3.3V. Refer to
section "Electrical Characteristics" for details.
• Bit 7:6 – PFDRV1:0 - Driver Strength Port F
206 _{ATmega256/128/64RFR2}
8393C-MCU Wireless-09/14