AT89LP51ED2-20MU Atmel, AT89LP51ED2-20MU Datasheet - Page 127

• Manufacturer Part Number: AT89LP51ED2-20MU
• Description: 8-bit Microcontrollers - MCU 64KB 20MHz 2.4V-5.5V
• Manufacturer: Atmel

Specifications of AT89LP51ED2-20MU

• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: VQFN-44
• Mounting Style: SMD/SMT
• Data Rom Size: 4 KB
• Interface Type: 2-Wire, SPI, UART
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Processor Series: AT89x
• Program Memory Type: Flash
• Factory Pack Quantity: 360

18. Enhanced Serial Peripheral Interface
3714A–MICRO–7/11
The Serial Peripheral Interface (SPI) allows high-speed, full-duplex synchronous data transfer
between the AT89LP51RD2/ED2/ID2 and peripheral devices or between multiple microcon-
troller devices, including multiple masters and slaves on a single bus. The SPI includes the
following features:
A block diagram of the SPI is shown below in
Figure 18-1. SPI Block Diagram
• Full-duplex, 3-wire or 4-wire Synchronous Data Transfer
• Master or Slave Operation
• Maximum Bit Frequency = f
• LSB First or MSB First Data Transfer
• Seven Programmable Bit Rates or Timer 1-based Baud Generation (Master Mode)
• End of Transmission Interrupt Flag
• Write Collision Flag Protection
• Double-buffered Receive and Transmit
• Transmit Buffer Empty Interrupt Flag
• Mode Fault (Master Collision) Detection and Interrupt
• Wake up from Idle Mode
T1 OVF
Clock Select
7-bit Divider
SPI Status Register
F
PERIPH
SPI Control
SPI Clock (Master)
SPI Inter r up t
AT89LP51RD2/ED2/ID2 Preliminary
Request
SYS
/2
MSTR
SPEN
8
MSB
Data Bus
Inte r na l
8
Figure
Read Data Buf f e r
W r ite Data Buf f e r
8-bit Shift Register
8
18-1.
SPI Control Register
Clo c k
Logic
LSB
S
M
M
S
S
M
MISO
MOSI
SCK
SS
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