ATMEGA16HVA-4CKU Atmel, ATMEGA16HVA-4CKU Datasheet - Page 127

• Manufacturer Part Number: ATMEGA16HVA-4CKU
• Description: MCU AVR 16K FLASH 4MHZ 36-LGA
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16HVA-4CKU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 7
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 9 V
• Data Converters: A/D 5x12b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 36-LGA
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: SPI
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRSB200, ATAVRSB201
• Minimum Operating Temperature: - 20 C
• On-chip Adc: 12 bit, 5 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

23.9
23.9.1
23.9.2
8024A–AVR–04/08
Register Description
BPPLR – Battery Protection Parameter Lock Register
BPCR – Battery Protection Control Register
tection interrupt request to the CPU. This interrupt can wake up the CPU from any operation
mode, except Power-off. The interrupt flags are cleared by writing a logic ‘1’ to their bit locations
from the CPU.
Note that there are neither flags nor status bits indicating that the chip has entered the Power Off
mode. This is because the CPU is powered down in this mode. The CPU will, however be able
to detect that it came from a Power-off situation by monitoring CPU reset flags when it resumes
operation.
• Bit 7:2 – Res: Reserved Bits
These bits are reserved and will always read as zero.
• Bit 1 – BPPLE: Battery Protection Parameter Lock Enable
• Bit 0 – BPPL: Battery Protection Parameter Lock
The BPCR, BPHCTR, BPOCTR, BPSCTR, BPDHCD, BPCHCD, BPDOCD, BPCOCD and
BPSCD Battery Protection registers can be locked from any further software updates. Once
locked, these registers cannot be accessed until the next hardware reset. This provides a safe
method for protecting the registers from unintentional modification by software runaway. It is rec-
ommended that software sets these registers shortly after reset, and then protect the registers
from further updates.
To lock these registers, the following algorithm must be followed:
1. In the same operation, write a logic one to BPPLE and BPPL.
2. Within the next four clock cycles, in the same operation, write a logic zero to BPPLE and
• Bits 7:6 – Res: Reserved Bits
These bits are reserved and will always read as zero.
• Bit 5 – Res: Reserved Bits
This bit are reserved and will always read as one.
Bit
(0xFE)
Read/Write
Initial Value
Bit
(0xFD)
Read/Write
Initial Value
a logic one to BPPL.
R
R
7
–
0
7
–
0
R
R
6
–
0
6
–
0
R
R
5
–
0
5
–
1
SCD
R/W
R
4
–
0
4
0
DOCD
R/W
R
3
–
0
3
0
ATmega8HVA/16HVA
COCD
R/W
R
2
–
0
2
0
BPPLE
DHCD
R/W
R/W
1
0
1
0
CHCD
BPPL
R/W
R/W
0
0
0
0
BPPLR
BPCR
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