AT89LP6440-20AU Atmel, AT89LP6440-20AU Datasheet - Page 130

• 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

Table 19-1.
Notes:
130
Symbol
CSA [1-0]
CONA
CFA
CENA
CMA [2-0]
ACSRA = 97H
Not Bit Addressable
Bit
1. CONA must be cleared to 0 before changing CSA[1-0].
2. Debouncing modes require the use of Timer 1 to generate the sampling delay.
AT89LP6440 - Preliminary
Function
Comparator A Positive Input Channel Select
CSA1
0
0
1
1
Comparator A Input Connect. When CONA = 1 the analog input pins are connected to the comparator. When CONA = 0
the analog input pins are disconnected from the comparator. CONA must be cleared to 0 before changing CSA[1-0] or
RFA[1-0].
Comparator A Interrupt Flag. Set when the comparator output meets the conditions specified by the CMA [2-0] bits and
CENA is set. The flag must be cleared by software. The interrupt may be enabled/disabled by setting/clearing bit 6 of IE.
Comparator A Enable. Set this bit to enable the comparator. Clearing this bit will force the comparator output low and
prevent further events from setting CFA. When CENA = 1 the analog input pins, P2.4—P2.7, have their digital inputs
disabled if they are configured in input-only mode.
Comparator A Interrupt Mode
CMA2
0
0
0
0
1
1
1
1
ACSRA
CSA1
7
– Analog Comparator A Control & Status Register
CSA0
0
1
0
1
CMA1
0
0
1
1
0
0
1
1
CSA0
6
A+ Channel
AIN0 (P2.4)
AIN1 (P2.5)
AIN2 (P2.6)
AIN3 (P2.7)
CMA0
0
1
0
1
0
1
0
1
CONA
5
Interrupt Mode
Negative (Low) level
Positive edge
Toggle with debouncing
Positive edge with debouncing
Negative edge
Toggle
Negative edge with debouncing
Positive (High) level
(1)
CFA
4
(2)
CENA
3
(2)
(2)
CMA2
2
Reset Value = 0000 0000B
CMA1
1
CMA0
3706A–MICRO–9/09
0