AT80C51RD2-SLSUM Atmel, AT80C51RD2-SLSUM Datasheet - Page 2

• Manufacturer Part Number: AT80C51RD2-SLSUM
• Description: MCU, 8BIT, 8051, 5V, SPI, 20MHZ, 44PLCC
• Manufacturer: Atmel

Specifications of AT80C51RD2-SLSUM

• Controller Family/series: (8051) 8052
• No. Of I/o's: 32
• Ram Memory Size: 1280Byte
• Cpu Speed: 40MHz
• No. Of Timers: 3
• No. Of Pwm Channels: 5
• Core Size: 8bit
• Oscillator Type: External Only
• Processor Series: AT80x
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Type: ROMLess
• Data Ram Size: 1280 B
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: PLCC
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Cpu Family: AT80
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 40MHz
• Program Memory Size: Not Required
• Total Internal Ram Size: 1.25KB
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. Description
2. Block Diagram
2
AT80C51RD2
ALE/
XTAL1
XTAL2
PSEN
PROG
WR
RD
EA
AT80C51RD2 microcontrollers are high performance versions of the 80C51 8-bit
microcontrollers.
The microcontrollers retain all features of the Atmel 80C52 with 256 bytes of internal RAM, a 7-
source 4-level interrupt controller and three timer/counters.
In addition, the microcontrollers have a Programmable Counter Array, an XRAM of 1024 byte, a
Hardware Watchdog Timer, a Keyboard Interface, a more versatile serial channel that facilitates
multiprocessor communication (EUART) and a speed improvement mechanism (X2 mode).
The microcontrollers have 2 software-selectable modes of reduced activity and 8 bit clock pres-
caler for further reduction in power consumption. In Idle mode, the CPU is frozen while the
peripherals and the interrupt system are still operating. In the Power-down mode, the RAM is
saved and all other functions are inoperative.
Table 1. Memory Size
Notes:
(2)
(2)
AT80C51RD2
CPU
1. Alternate function of Port 1
2. Alternate function of Port 3
(2) (2)
(2)
Timer 0
Timer 1
EUART
BRG
(2)
+
CORE
C51
(2) (2)
256x8
RAM
INT
Ctrl
ROM (Bytes)
ROMless
IB-bus
Parallel I/O Ports & Ext. Bus
Port 0Port 1 Port 2 Port 3
XRAM
1Kx8
XRAM (Bytes)
(1)
1024
PCA
(1)
(1)
Watch
Dog
Timer2
(1)
TOTAL RAM (Bytes)
Board
Key
1280
4113D–8051–01/09
I/O
32