ATMEGA169P-16MCH Atmel, ATMEGA169P-16MCH Datasheet - Page 249

• Manufacturer Part Number: ATMEGA169P-16MCH
• Description: MCU AVR 16KB FLASH 16MHZ 64-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA169P-16MCH

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRBFLY - KIT EVALUATION AVR BUTTERFLYATSTK502 - MOD EXPANSION AVR STARTER 500ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8018P–AVR–08/10
• Bit 3 – Res: Reserved Bit
This bit is reserved and will always read as zero.
• Bits 2:0 – LCDCD2:0: LCD Clock Divide 2, 1, and 0
The LCDCD2:0 bits determine division ratio in the clock divider. The various selections are
shown in
Table 23-5.
The frame frequency can be calculated by the following equation:
Where:
This is a very flexible scheme, and users are encouraged to calculate their own table to investi-
gate the possible frame rates from the formula above. Note when using 1/3 duty the frame rate
is increased with 33% when Frame Rate Register is constant. Example of frame rate calculation
is shown in
Table 23-6.
clk
4 MHz
4 MHz
32.768 kHz
32.768 kHz
LCDCD2
LCD
0
0
0
0
1
1
1
1
N = prescaler divider (16, 64, 128, 256, 512, 1024, 2048, or 4096).
K = 8 for duty = 1/4, 1/2, and static.
K = 6 for duty = 1/3.
D = Division factor (see
Table
Table
LCDCD1
LCD Clock Divide
Example of frame rate calculation
23-5. This Clock Divider gives extra flexibility in frame rate selection.
duty
1/4
1/3
Static
1/2
0
0
1
1
0
0
1
1
23-6.
K
LCDCD0
8
6
8
8
0
1
0
1
0
1
0
1
Table
N
2048
2048
16
16
23-5).
Output from Prescaler
f
frame
LCDCD2:0
divided by (D):
011
011
000
100
=
1
2
3
4
5
6
7
8
------------------------- -
(
K N D
f
clk
⋅
LCD
⋅
D
)
4
4
1
5
Duty = 1/4, gives a frame rate of:
clk
Frame Rate
4000000/(8*2048*4) = 61Hz
4000000/(6*2048*4) = 81Hz
32768/(8*16*1) = 256Hz
32768/(8*16*5) = 51Hz
LCD
= 32.768 kHz, N = 16, and
ATmega169P
85.3Hz
51.2Hz
42.7Hz
36.6Hz
256Hz
128Hz
64Hz
32Hz
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