AT89C51IC2-SLRUM Atmel, AT89C51IC2-SLRUM Datasheet - Page 71
AT89C51IC2-SLRUM
Manufacturer Part Number
AT89C51IC2-SLRUM
Description
IC 8051 MCU 32K FLASH 44-PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C51IC2-SLRIM.pdf
(147 pages)
Specifications of AT89C51IC2-SLRUM
Core Processor
8051
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
For Use With
AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Other names
AT89C51IC2-SLRUMTR
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Serial Port Interface
(SPI)
Features
Signal Description
Master Output Slave Input
(MOSI)
Master Input Slave Output
(MISO)
SPI Serial Clock (SCK)
Slave Select (SS)
4301D–8051–02/08
The Serial Peripheral Interface Module (SPI) allows full-duplex, synchronous, serial
communication between the MCU and peripheral devices, including other MCUs.
Features of the SPI Module include the following:
•
•
•
•
•
•
Figure 26 shows a typical SPI bus configuration using one Master controller and many
Slave peripherals. The bus is made of three wires connecting all the devices.
Figure 26. SPI Master/Slaves Interconnection
The Master device selects the individual Slave devices by using four pins of a parallel
port to control the four SS pins of the Slave devices.
This 1-bit signal is directly connected between the Master Device and a Slave Device.
The MOSI line is used to transfer data in series from the Master to the Slave. Therefore,
it is an output signal from the Master, and an input signal to a Slave. A Byte (8-bit word)
is transmitted most significant bit (MSB) first, least significant bit (LSB) last.
This 1-bit signal is directly connected between the Slave Device and a Master Device.
The MISO line is used to transfer data in series from the Slave to the Master. Therefore,
it is an output signal from the Slave, and an input signal to the Master. A Byte (8-bit
word) is transmitted most significant bit (MSB) first, least significant bit (LSB) last.
This signal is used to synchronize the data movement both in and out of the devices
through their MOSI and MISO lines. It is driven by the Master for eight clock cycles
which allows to exchange one Byte on the serial lines.
Each Slave peripheral is selected by one Slave Select pin (SS). This signal must stay
low for any message for a Slave. It is obvious that only one Master (SS high level) can
Full-duplex, three-wire synchronous transfers
Master or Slave operation
Eight programmable Master clock rates
Serial clock with programmable polarity and phase
Master Mode fault error flag with MCU interrupt capability
Write collision flag protection
Master
Slave 4
MISO
MOSI
SCK
SS
0
1
2
3
VDD
Slave 3
Slave 1
Slave 2
71
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