ATMEGA8515-16JU Atmel, ATMEGA8515-16JU Datasheet - Page 95
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ATMEGA8515-16JU
Manufacturer Part Number
ATMEGA8515-16JU
Description
IC MCU AVR 8K 16MHZ IND 44-PLCC
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515-16JU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Package
44PLCC
Device Core
AVR
Family Name
ATmega
Maximum Speed
16 MHz
Operating Supply Voltage
5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
35
Interface Type
SPI/USART
Number Of Timers
2
Processor Series
ATMEGA8x
Core
AVR8
Data Ram Size
512 B
Maximum Clock Frequency
16 MHz
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
Minimum Operating Temperature
- 40 C
Cpu Family
ATmega
Device Core Size
8b
Frequency (max)
16MHz
Total Internal Ram Size
512Byte
# I/os (max)
35
Number Of Timers - General Purpose
2
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
4.5V
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PLCC
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEMATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Timer/Counter0 and
Timer/Counter1
Prescalers
Internal Clock Source
Prescaler Reset
External Clock Source
2512K–AVR–01/10
Timer/Counter1 and Timer/Counter0 share the same prescaler module, but the
Timer/Counters can have different prescaler settings. The description below applies to
both Timer/Counter1 and Timer/Counter0.
The Timer/Counter can be clocked directly by the system clock (by setting the
CSn2:0 = 1). This provides the fastest operation, with a maximum Timer/Counter clock
frequency equal to system clock frequency (f
the prescaler can be used as a clock source. The prescaled clock has a frequency of
either f
The prescaler is free running, i.e., operates independently of the clock select logic of the
Timer/Counter, and it is shared by Timer/Counter1 and Timer/Counter0. Since the pres-
caler is not affected by the Timer/Counter’s clock select, the state of the prescaler will
have implications for situations where a prescaled clock is used. One example of pres-
caling artifacts occurs when the timer is enabled and clocked by the prescaler
(6 > CSn2:0 > 1). The number of system clock cycles from when the timer is enabled to
the first count occurs can be from 1 to N+1 system clock cycles, where N equals the
prescaler divisor (8, 64, 256, or 1024).
It is possible to use the Prescaler Reset for synchronizing the Timer/Counter to program
execution. However, care must be taken if the other Timer/Counter that shares the
same prescaler also uses prescaling. A Prescaler Reset will affect the prescaler period
for all Timer/Counters it is connected to.
An external clock source applied to the T1/T0 pin can be used as Timer/Counter clock
(clk
chronization logic. The synchronized (sampled) signal is then passed through the edge
detector. Figure 45 shows a functional equivalent block diagram of the T1/T0 synchroni-
zation and edge detector logic. The registers are clocked at the positive edge of the
internal system clock (
system clock.
The edge detector generates one clk
ative (CSn2:0 = 6) edge it detects.
Figure 45. T1/T0 Pin Sampling
The synchronization and edge detector logic introduces a delay of 2.5 to 3.5 system
clock cycles from an edge has been applied to the T1/T0 pin to the counter is updated.
Enabling and disabling of the clock input must be done when T1/T0 has been stable for
at least one system clock cycle, otherwise it is a risk that a false Timer/Counter clock
pulse is generated.
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
Tn
T1
clk
/clk
I/O
CLK_I/O
T0
). The T1/T0 pin is sampled once every system clock cycle by the pin syn-
/8, f
D
LE
CLK_I/O
Q
Synchronization
/64, f
clk
D
I/O
). The latch is transparent in the high period of the internal
CLK_I/O
Q
/256, or f
T1
/clk
ExtClk
T
0
CLK_I/O
< f
pulse for each positive (CSn2:0 = 7) or neg-
CLK_I/O
clk_I/O
/1024.
). Alternatively, one of four taps from
/2) given a 50/50% duty cycle. Since
D
ATmega8515(L)
Q
Edge Detector
Tn_sync
(To Clock
Select Logic)
95