AT90S8515-4PI Atmel, AT90S8515-4PI Datasheet - Page 23

• Manufacturer Part Number: AT90S8515-4PI
• Description: IC MCU 8K FLSH 4MHZ LV IT 40DIP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S8515-4PI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• 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): 2.7 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

Reset Sources
0841G–09/01
The AT90S8515 has three sources of reset:
•
•
•
During reset, all I/O registers are set to their initial values and the program starts execu-
tion from address $000. The instruction placed in address $000 must be an RJMP
(relative jump) instruction to the reset handling routine. If the program never enables an
interrupt source, the interrupt vectors are not used and regular program code can be
placed at these locations. The circuit diagram in Figure 23 shows the reset logic. Table 3
defines the timing and electrical parameters of the reset circuitry.
Figure 23. Reset Logic
Table 3. Reset Characteristics
Note:
Symbol
V
e:)
V
t
t
TOUT
TOUT
POT
RST
$00f
$010
$011
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on
Reset threshold (V
External Reset. The MCU is reset when a low level is present on the RESET pin for
more than 50 ns.
Watchdog Reset. The MCU is reset when the Watchdog timer period expires and
the Watchdog is enabled.
(Not
…
The Power-on Reset will not work unless the supply voltage has been below V
(falling).
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
RESET Pin Threshold Voltage
Reset Delay Time-out Period FSTRT
Unprogrammed
Reset Delay Time-out Period FSTRT
Programmed
…
POT
).
ldi r16,low(RAMEND)
out SPL,r16
<instr>
…
…
xxx
11.0
0.25
Min
0.8
0.2
–
16.0
0.28
Typ
1.2
0.4
AT90S8515
–
0.9 V
Max
21.0
0.31
1.6
0.6
CC
Units
ms
ms
V
V
V
POT
23