AT90S1200-4PC Atmel, AT90S1200-4PC Datasheet - Page 13

• Manufacturer Part Number: AT90S1200-4PC
• Description: IC MCU 1K FLSH 4MHZ LV 20DIP
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S1200-4PC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: SPI
• Peripherals: POR, WDT
• Number Of I /o: 15
• Program Memory Size: 1KB (512 x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Ram Size: -
• Data Converters: -

Power-on Reset
0838H–AVR–03/02
Figure 13. Reset Logic
Table 3. Reset Characteristics (V
Note:
A Power-on Reset (POR) circuit ensures that the device is reset from power-on. As
shown in Figure 13, 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
Figure 14. MCU Start-up, RESET Tied to V
If the built-in start-up delay is sufficient, RESET can be connected to V
an external pull-up resistor. By holding the RESET pin low for a period after V
Symbol
V
V
t
t
INTERNAL
TIME-OUT
POR
TOUT
POT
RST
RESET
RESET
RESET
V
(1)
CC
VCC
1. 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)
Pin Threshold Voltage
Power-on Reset Period
Reset Delay Time-out Period (The Time-out
period equals 16K WDT cycles. See “Typical
Characteristics” on page 51. for typical WDT
frequency at different voltages).
100 - 500K
Power-on Reset
RC Oscillator
Reset Circuit
Watchdog
On-chip
Timer
Circuit
POT
V
V
POT
RST
), regardless of the V
t
TOUT
CC
POR
= 5.0V)
14-stage Ripple Counter
CC
.
CC
rise time (see Figure 14).
11.0
Min
0.8
0.2
2.0
–
Time-out
CC
16.0
Typ
1.2
0.4
3.0
has reached the Power-
–
AT90S1200
0.85 V
S
R
CC
Max
21.0
1.6
0.6
4.0
directly or via
CC
Q
Q
CC
Units
ms
ms
V
V
V
has
POT
13