ATMEGA169L-8MI Atmel, ATMEGA169L-8MI Datasheet - Page 223

• Manufacturer Part Number: ATMEGA169L-8MI
• Description: IC MCU AVR 16K LV 8MHZ IND 64QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA169L-8MI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• 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-MLF®, 64-QFN
• For Use With: ATAVRISP2 - PROGRAMMER AVR IN SYSTEMATAVRBFLY - KIT EVALUATION AVR BUTTERFLYATSTK502 - MOD EXPANSION AVR STARTER 500
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATMEGA169L-4MI; ATMEGA169L-4MI

2514H–AVR–05/03
• Bit 3 – Res: Reserved Bit
This bit is reserved bit in the ATmega169 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 97. This Clock Divider gives extra flexibility in frame rate selection.
Table 97. LCD Clock Divide
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
investigate 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 98.
Table 98. Example of frame rate calculation
LCDCD2
ckl
4 MHz
4 MHz
32.768 kHz
32.768 kHz
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.
LCD
0
0
0
0
1
1
1
1
LCDCD1
duty
1/4
1/3
Static
1/2
0
0
1
1
0
0
1
1
K
8
6
8
8
LCDCD0
LCDPS2:0
6
6
0
0
0
1
0
1
0
1
0
1
f
frame
Output from
Divided by:
Prescaler
=
---------------------------------------------------------
N
2048
2048
16
16
K N
1
2
3
4
5
6
7
8
LCDCS2:0
3
3
0
4
f
1
c lk
+
LCD
clk
LCDCD
LCD
= 1/4, gives a frame rate of:
= 32.768 kHz, N = 16, and Duty
ATmega169V/L
Frame Rate
4000000/(8*2048*(1+3)) =
61 Hz
4000000/(6*2048*(1+3)) =
81 Hz
32768/(8*16*(1+0)) = 256 Hz
32768/(8*16*(1+4)) = 51 Hz
85.3 Hz
51.2 Hz
42.7 Hz
36.6 Hz
256 Hz
128 Hz
64 Hz
32 Hz
223