AT90S2333-8PC Atmel, AT90S2333-8PC Datasheet - Page 22
AT90S2333-8PC
Manufacturer Part Number
AT90S2333-8PC
Description
IC MCU 2K FLSH 8MHZ A/D 28DIP
Manufacturer
Atmel
Series
AVR® 90Sr
Datasheet
1.AT90LS2333-4AC.pdf
(103 pages)
Specifications of AT90S2333-8PC
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
20
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 6 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
28-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 22 of 103
- Download datasheet (2Mb)
Figure 28. Brown-Out Reset During Operation
Watchdog Reset
When the Watchdog times out, it will generate a short reset pulse of 1 XTAL cycle duration. On the falling edge of this
pulse, the delay timer starts counting the Time-out period t
Watchdog.
Figure 29. Watchdog Reset During Operation
MCU Status Register - MCUSR
The MCU Status Register provides information on which reset source caused an MCU reset.
•
These bits are reserved bits in the AT90S2333 and always read as zero.
•
This bit is set if a watchdog reset occurs. The bit is cleared by a power-on reset, or by writing a logic zero to the flag.
•
This bit is set if a brown-out reset occurs. The bit is cleared by a power-on reset, or by writing a logic zero to the flag.
•
This bit is set if an external reset occurs. The bit is cleared by a power-on reset, or by writing a logic zero to the flag.
•
This bit is set if a power-on reset occurs. The bit is cleared only by writing a logic zero to the flag.
22
Bit
$34 ($54)
Read/Write
Initial value
Bits 7..4 - Res: Reserved Bits
Bit 3 - WDRF: Watchdog Reset Flag
Bit 2 - BORF: Brown-Out Reset Flag
Bit 1 - EXTRF: External Reset Flag
Bit 0 - PORF: Power-on Reset Flag
AT90S/LS2333 and AT90S/LS4433
R
7
0
-
R
6
0
-
INTERNAL
TIME-OUT
RESET
RESET
VCC
R
5
0
-
R
4
0
-
V
BOT-
WDRF
R/W
3
TOUT
BORF
. Refer to Page page 36 for details on operation of the
R/W
2
See bit description
V
t
EXTRF
TOUT
BOT+
R/W
1
PORF
R/W
0
MCUSR
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