AT89LP6440-20AU Atmel, AT89LP6440-20AU Datasheet - Page 191

• Manufacturer Part Number: AT89LP6440-20AU
• Description: MCU 8051 64K FLASH ISP 44TQFP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20AU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Package: 44TQFP
• Device Core: 8051
• Family Name: 89LP
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 2.5|3.3 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 38
• Interface Type: 2-Wire/SPI
• On-chip Dac: 8-chx10-bit
• Number Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3706A–MICRO–9/09
16 Serial Interface (UART) .......................................................................... 84
17 Enhanced Serial Peripheral Interface .................................................. 97
18 Two-Wire Serial Interface .................................................................... 104
19 Dual Analog Comparators ................................................................... 126
20 Digital-to-Analog/Analog-to-Digital Converter .................................. 133
16.1
16.2
16.3
16.4
16.5
16.6
16.7
17.1
17.2
17.3
17.4
18.1
18.2
18.3
18.4
18.5
18.6
19.1
19.2
19.3
20.1
20.2
20.3
20.4
20.5
Multiprocessor Communications .....................................................................84
Baud Rates ......................................................................................................86
More About Mode 0 .........................................................................................88
More About Mode 1 .........................................................................................91
More About Modes 2 and 3 .............................................................................93
Framing Error Detection ..................................................................................96
Automatic Address Recognition ......................................................................96
Master Operation .............................................................................................99
Slave Operation .............................................................................................100
Pin Configuration ...........................................................................................100
Serial Clock Timing ........................................................................................103
Data Transfer and Frame Format ..................................................................105
Multi-master Bus Systems, Arbitration and Synchronization .........................107
Overview of the TWI Module .........................................................................109
Register Overview .........................................................................................111
Using the TWI ................................................................................................112
Transmission Modes .....................................................................................114
Analog Input Muxes .......................................................................................127
Internal Reference Voltage ............................................................................128
Comparator Interrupt Debouncing .................................................................128
ADC Operation ..............................................................................................135
DAC Operation ..............................................................................................136
Clock Selection ..............................................................................................137
Starting a Conversion ....................................................................................137
Noise Considerations ....................................................................................138