AT89LP6440-20PU Atmel, AT89LP6440-20PU Datasheet - Page 131

• Manufacturer Part Number: AT89LP6440-20PU
• Description: MCU 8051 64K FLASH ISP 40PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20PU

• 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: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 19-2.
Notes:
3706A–MICRO–9/09
Symbol
CSB [1-0]
CONB
CFB
CENB
CMB [2-0]
ACSRB = 9FH
Not Bit Addressable
Bit
1. CONB must be cleared to 0 before changing CSB[1-0].
2. Debouncing modes require the use of Timer 1 to generate the sampling delay.
Function
Comparator B Positive Input Channel Select
CSB1
0
0
1
1
Comparator B Input Connect. When CONB = 1 the analog input pins are connected to the comparator. When CONB = 0
the analog input pins are disconnected from the comparator. CONB must be cleared to 0 before changing CSB[1-0] or
RFB[1-0].
Comparator B Interrupt Flag. Set when the comparator output meets the conditions specified by the CMB [2-0] bits and
CENB is set. The flag must be cleared by software. The interrupt may be enabled/disabled by setting/clearing bit 6 of IE.
Comparator B Enable. Set this bit to enable the comparator. Clearing this bit will force the comparator output low and
prevent further events from setting CFB. When CENB = 1 the analog input pins, P2.4—P2.7, have their digital inputs
disabled if they are configured in input-only mode.
Comparator B Interrupt Mode
CMB2
0
0
0
0
1
1
1
1
ACSRB
CSB1
7
– Analog Comparator B Control & Status Register
CSB0
0
1
0
1
CMB1
0
0
1
1
0
0
1
1
CSB0
6
B+ Channel
AIN0 (P2.4)
AIN1 (P2.5)
AIN2 (P2.6)
AIN3 (P2.7)
CMB0
0
1
0
1
0
1
0
1
CONB
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)
CFB
4
(2)
CENB
3
(2)
(2)
AT89LP6440 - Preliminary
CMB2
2
Reset Value = 1100 0000B
CMB1
1
CMB0
0
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