AT90S8515A-8JI Atmel, AT90S8515A-8JI Datasheet - Page 24
AT90S8515A-8JI
Manufacturer Part Number
AT90S8515A-8JI
Description
IC MCU 8K FLSH 8MHZ IT 44PLCC
Manufacturer
Atmel
Series
AVR® 90Sr
Datasheets
1.AT90S8515-4AC.pdf
(112 pages)
2.AT90S8515-4AC.pdf
(4 pages)
3.AT90S8515-4AC.pdf
(4 pages)
Specifications of AT90S8515A-8JI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
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Power-on Reset
24
AT90S8515
The user can select the start-up time according to typical oscillator start-up. The number
of WDT oscillator cycles used for each time-out is shown in Table 4. The frequency of
the Watchdog Oscillator is voltage-dependent as shown in “Typical Characteristics” on
page 95.
Table 4. Number of Watchdog Oscillator Cycles
A Power-on Reset (POR) circuit ensures that the device is reset from power-on. As
shown in Figure 23, an internal timer clocked from the Watchdog Timer oscillator pre-
vents the MCU from starting until after a certain period after V
on Threshold Voltage (V
FSTRT Fuse bit in the Flash can be programmed to give a shorter start-up time if a
ceramic resonator or any other fast-start oscillator is used to clock the MCU.
If the built-in start-up delay is sufficient, RESET can be connected to V
an external pull-up resistor. By holding the pin low for a period after V
applied, the Power-on Reset period can be extended. Refer to Figure 25 for a timing
example of this.
Figure 24. MCU Start-up, RESET Tied to V
Figure 25. MCU Start-up, RESET Controlled Externally
INTERNAL
INTERNAL
TIME-OUT
TIME-OUT
FSTRT
Programmed
Unprogrammed
RESET
RESET
RESET
RESET
VCC
VCC
V
V
V
Time-out at V
0.28 ms
16.0 ms
POT
POT
RST
POT
t
), regardless of the V
TOUT
CC
= 5V
V
RST
CC
.
t
TOUT
CC
Number of WDT Cycles
256
16K
rise time (see Figure 24). The
CC
has reached the Power-
CC
directly or via
CC
has been
0841G–09/01
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