AT90LS4433-4PI Atmel, AT90LS4433-4PI Datasheet - Page 49
![IC MCU 4K FLSH 4MHZ A/D LV 28DIP](/photos/7/21/72189/453-28-dip_sml.jpg)
AT90LS4433-4PI
Manufacturer Part Number
AT90LS4433-4PI
Description
IC MCU 4K FLSH 4MHZ A/D LV 28DIP
Manufacturer
Atmel
Series
AVR® 90LSr
Datasheet
1.AT90S4433-8AC.pdf
(126 pages)
Specifications of AT90LS4433-4PI
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
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
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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SS Pin Functionality
1042H–AVR–04/03
Figure 37. SPI Master-slave Interconnection
The system is single buffered in the transmit direction and double buffered in the receive
direction. This means that bytes to be transmitted cannot be written to the SPI Data
Register before the entire shift cycle is completed. When receiving data, however, a
received byte must be read from the SPI Data Register before the next byte has been
completely shifted in. Otherwise, the first byte is lost.
When the SPI is enabled, the data direction of the MOSI, MISO, SCK, and SS pins is
overridden according to Table 17.
Table 17. SPI Pin Direction Overrides
Note:
When the SPI is configured as a Master (MSTR in SPCR is set), the user can determine
the direction of the SS pin. If SS is configured as an output, the pin is a general output
pin, which does not affect the SPI system. If SS is configured as an input, it must be held
high to ensure Master SPI operation. If the SS pin is driven low by peripheral circuitry
when the SPI is configured as master with the SS pin defined as an input, the SPI sys-
tem interprets this as another master selecting the SPI as a slave and starts to send
data to it. To avoid bus contention, the SPI system takes the following actions:
1. The MSTR bit in SPCR is cleared and the SPI system becomes a Slave. As a
2. The SPIF Flag in SPSR is set, and if the SPI interrupt is enabled and the I-bit in
Thus, when interrupt-driven SPI transmittal is used in Master mode, and there exists a
possibility that SS is driven low, the interrupt should always check that the MSTR bit is
still set. Once the MSTR bit has been cleared by a slave select, it must be set by the
user to re-enable the SPI Master mode.
When the SPI is configured as a slave, the SS pin is always input. When SS is held low,
the SPI is activated and MISO becomes an output if configured so by the user. All other
MOSI
MISO
SCK
Pin
SS
result of the SPI becoming a Slave, the MOSI and SCK pins become inputs.
SREG is set, the interrupt routine will be executed.
1. See “Alternate Functions of Port B” on page 73 for a detailed description of how to
Direction Overrides, Master SPI Mode
User Defined
Input
User Defined
User Defined
define the direction of the user-defined SPI pins.
(1)
Direction Overrides, Slave SPI Modes
Input
User Defined
Input
Input
AT90S/LS4433
49
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