AT89LP51ED2-20AAU Atmel, AT89LP51ED2-20AAU Datasheet - Page 165

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

Specifications of AT89LP51ED2-20AAU

• 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: LQFP-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

Table 20-3.
Notes:
3714A–MICRO–7/11
Symbol
CMPB
CMPA
RFB
CCS
RFA
1-0
AREF = BDH
Not Bit Addressable
Bit
1-0
1-0
1. CONB (ACSRB.5) must be cleared to 0 before changing RFB[1-0].
2. CONA (ACSRA.5) must be cleared to 0 before changing RFA[1-0].
Function
Comparator B Output.
Copy of Comparator B raw output value sampled by the system clock.
Comparator A Output
Copy of Comparator A raw output value sampled by the system clock.
Comparator B Negative Input Channel Select
CRF1
0
0
0
0
Comparator Clock Select
CCS1
0
0
0
0
Comparator A Negative Input Channel Select
RFA1
0
0
0
0
AREF
CMPB
7
– Analog Comparator Reference Control Register
RFB0
0
0
1
1
CCS0
0
0
1
1
RFA0
0
0
1
1
CMPA
6
B- Channel
AIN2 (P2.6)
Internal V
Internal V
Internal V
Clock Source
System Clock
Timer 0 Overflow
Timer 1 Overflow
Timer 2 Overflow
A- Channel
AIN1 (P2.5)
Internal V
Internal V
Internal V
RFB1
AREF-Δ
AREF
AREF+Δ
AREF-Δ
AREF
AREF+Δ
5
(~1.25V)
(~1.25V)
(~1.125V)
(~1.125V)
(~1.375V)
(~1.375V)
AT89LP51RD2/ED2/ID2 Preliminary
RFB0
(1)
(2)
4
CCS1
3
CCS0
2
Reset Value = 0000 0000B
RFA1
1
RFA0
0
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