AT89LP52-20JU Atmel, AT89LP52-20JU Datasheet - Page 7

• Manufacturer Part Number: AT89LP52-20JU
• Description: IC MCU 8051 8K FLASH SPI 44PLCC
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP52-20JU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-LCC (J-Lead)
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: Serial
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

2.1
2.2
2.2.1
3709B–MICRO–12/10
Block Diagram
Comparison to AT89S51/52
Instruction Execution
Figure 2-1.
The AT89LP51/52 is part of a family of devices with enhanced features that are fully binary com-
patible with the 8051 instruction set. The AT89LP51/52 has two modes of operations,
Compatibility mode and Fast mode. In Compatibility mode the instruction timing, peripheral
behavior, SFR addresses, bit assignments and pin functions are identical to Atmel's existing
AT89S51/52 product. Additional enhancements are transparent to the user and can be used if
desired. Fast mode allows greater performance, but with some differences in behavior. The
major enhancements from the AT89S51/52 are outlined in the following paragraphs and may be
useful to users migrating to the AT89LP51/52 from older devices. A summary of the differences
between Compatibility and Fast modes is given in
note “Migrating from AT89S52 to AT89LP52.”
In Compatibility mode the AT89LP51/52 CPU uses the six-state machine cycle of the standard
8051 where instruction bytes are fetched every three system clock cycles. Execution times in
this mode are identical to AT89S51/52. For greater performance the user can enable Fast mode
Resonator
Crystal or
AT89LP51/52 Block Diagram
Configurable I/O
Configurable I/O
Configurable I/O
Configurable I/O
Configurable I/O
4K/8K Bytes
Flash Code
Configurable
Oscillator
Port 1
Port 2
Port 3
Port 4
Port 0
8051 Single Cycle CPU
Flash Data
256 Bytes
with 12-cycle Compatibility
AT89LP51/52 - Preliminary
Table 2-1 on page
256 Bytes
RAM
16-bit Timer 0
16-bit Timer 1
16-bit Timer 2
RC Auxiliary
Watchdog
Oscillator
UART
Interface
Timer
POR
BOD
XRAM
9. See also the Application
7