ATMEGA162L-8MI Atmel, ATMEGA162L-8MI Datasheet - Page 103

• Manufacturer Part Number: ATMEGA162L-8MI
• Description: IC MCU AVR 16K 3V 8MHZ 44-QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA162L-8MI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 35
• 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
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-VQFN Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Special Function IO Register –
SFIOR
2513C–AVR–09/02
Each half period of the external clock applied must be longer than one system clock
cycle to ensure correct sampling. The external clock must be guaranteed to have less
than half the system clock frequency (f
the edge detector uses sampling, the maximum frequency of an external clock it can
detect is half the sampling frequency (Nyquist sampling theorem). However, due to vari-
ation of the system clock frequency and duty cycle caused by Oscillator source (crystal,
resonator, and capacitors) tolerances, it is recommended that maximum frequency of an
external clock source is less than f
An external clock source can not be prescaled.
Figure 45. Prescaler for Timer/Counter0, Timer/Counter1, and Timer/Counter3
Note:
• Bit 7 – TSM: Timer/Counter Synchronization Mode
Writing the TSM bit to one activates the Timer/Counter Synchronization mode. In this
mode, the value that is written to the PSR2 and PSR310 bits is kept, hence keeping the
corresponding prescaler reset signals asserted. This ensures that the corresponding
Timer/Counters are halted and can be configured to the same value without the risk of
one of them advancing during configuration. When the TSM bit is written to zero, the
PSR2 and PSR310 bits are cleared by hardware, and the Timer/Counters start counting
simultaneously.
• Bit 0 – PSR310: Prescaler Reset Timer/Counter3, Timer/Counter1, and
When this bit is one, the Timer/Counter3, Timer/Counter1, and Timer/Counter0 pres-
caler will be reset. This bit is normally cleared immediately by hardware, except if the
TSM bit is set. Note that Timer/Counter3, Timer/Counter1, and Timer/Counter0 share
the same prescaler and a reset of this prescaler will affect all three timers.
Bit
Read/Write
Initial Value
Timer/Counter0
CS30
CS31
CS32
1. The synchronization logic on the input pins (
TIMER/COUNTER3 CLOCK SOURCE
0
PSR321
TSM
R/W
CK
7
0
clk
T3
XMBK
R/W
6
0
T1
XMM2
CS10
CS11
CS12
R/W
5
0
clk_I/O
Clear
ExtClk
TIMER/COUNTER1 CLOCK SOURCE
/2.5.
XMM1
0
R/W
4
0
< f
10-BIT T/C PRESCALER
clk
clk_I/O
T1
XMM0
R/W
3
0
Tn/T0)
/2) given a 50/50% duty cycle. Since
ATmega162(V/U/L)
PUD
T0
R/W
is shown in Figure 44.
2
0
CS00
CS01
CS02
PSR2
R/W
1
0
TIMER/COUNTER1 CLOCK SOURCE
0
PSR310
R/W
clk
0
0
T0
(1)
SFIOR
103