AT90LS4433-4AC Atmel, AT90LS4433-4AC Datasheet - Page 21

• Manufacturer Part Number: AT90LS4433-4AC
• Description: IC MCU 4K 4MHZ A/D LV 32TQFP
• Manufacturer: Atmel
• Series: AVR® 90LSr

Specifications of AT90LS4433-4AC

• 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: 20
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Data Converters: A/D 6x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Reset Sources
1042H–AVR–04/03
The most typical program setup for the Reset and Interrupt Vector addresses are:
The AT90S4433 has four sources of reset:
•
•
•
•
During Reset, all I/O Registers are then set to their Initial Values, and the program starts
execution 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 24 shows the Reset Logic. Table
4 and Table 5 define the timing and electrical parameters of the reset circuitry.
Address
$000
$001
$002
$003
$004
$005
$006
$007
$008
$009
$00a
$00b
$00c
$00d
;
$00e
$00f
$010
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.
Brown-out Reset. The MCU is reset when the supply voltage (V
certain voltage.
…
Labels Code
MAIN:
…
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
rjmp
ldi
out
<instr>
…
POT
).
…
RESET
EXT_INT0
EXT_INT1
TIM1_CAPT
TIM1_COMP
TIM1_OVF
TIM0_OVF
SPI_STC;
UART_RXC
UART_DRE
UART_TXC
ADC
EE_RDY
ANA_COMP
r16,low(RAMEND); Main program start
SP,r16;
xxx
; ADC Conversion Complete Interrupt Handler
Comments
; Reset Handler
; IRQ0 Handler
; IRQ1 Handler
; Timer1 Capture Handler
; Timer1 compare Handler
; Timer1 Overflow Handler
; Timer0 Overflow Handler
; SPI Transfer Complete Handler
; UART RX Complete Handler
; UDR Empty Handler
; UART TX Complete Handler
; EEPROM Ready Handler
; Analog Comparator Handler
;
AT90S/LS4433
CC
) falls below a
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