AT89LP3240 Atmel Corporation, AT89LP3240 Datasheet - Page 130

• Manufacturer Part Number: AT89LP3240
• Manufacturer: Atmel Corporation

Specifications of AT89LP3240

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 38
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 153.8
• Sram (kbytes): 4.25
• Eeprom (bytes): 8192
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 3.6
• Timers: 3
• Isp: SPI/OCD
• Watchdog: Yes

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.
AT89LP3240/6440
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
3706C–MICRO–2/11
0