AT89LP51ED2-20AU Atmel, AT89LP51ED2-20AU Datasheet - Page 120

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

Specifications of AT89LP51ED2-20AU

• Rohs: yes
• Core: 8051
• Processor Series: AT89x
• 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: TQFP-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
• Program Memory Type: Flash
• Factory Pack Quantity: 160

Figure 17-2. Mode 0 Waveforms (Two-Wire)
Figure 17-3. UART Mode 0 TWI Emulation (SMOD1 = 1)
120
Write to SBUF
(SDA) RXD
(SCL) TXD
AT89LP51RD2/ED2/ID2 Preliminary
SMOD1 = 0
SM2 = 0
SMOD1 = 1
SM2 = 0
SMOD1 = 0
SM2 = 1
SMOD1 = 1
SM2 = 1
SM2
P3.0
TI
RXD (RX)
RXD (RX)
RXD (RX)
RXD (RX)
RXD (TX)
RXD (TX)
RXD (TX)
RXD (TX)
TXD
TXD
TXD
TXD
0
1
0
0
0
0
0
0
0
0
2
1
1
1
1
1
1
1
1
3
2
2
2
2
2
2
2
2
4
3
3
3
3
3
3
3
3
5
4
4
4
4
4
4
4
4
6
5
5
5
5
5
5
Sample ACK
5
5
7
6
6
6
6
6
6
6
6
ACK
7
7
7
7
7
7
7
7
3714A–MICRO–7/11