AT89LP428 Atmel Corporation, AT89LP428 Datasheet - Page 104

• Manufacturer Part Number: AT89LP428
• Manufacturer: Atmel Corporation

Specifications of AT89LP428

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 25 MHz
• Cpu: 8051-1C
• Max I/o Pins: 30
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.75
• Eeprom (bytes): 512
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 3
• Isp: SPI/OCD
• Watchdog: Yes

Table 18-3.
Notes:
104
Symbol
CSC
[1 - 0]
RFB
[1 - 0]
CAC
[1 - 0]
RFB
[1 - 0]
AREF = AFH
Not Bit Addressable
Bit
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].
AT89LP428/828
Function
Comparator B Clock Select
Comparator B Negative Input Channel Select
Comparator A Clock Select
Comparator A Negative Input Channel Select
CBC1
CRF1
CAC1
AREF
RFA1
CBC1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
– Analog Comparator Reference Control Register
CBC0
CAC0
RFB0
RFA0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
CBC0
6
Clock Source
System Clock
Timer 0 Overflow
Timer 1 Overflow
Timer 2 Overflow
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
(~1.3V)
(~1.3V)
(~1.2V)
(~1.2V)
(~1.4V)
(~1.4V)
(1)
(2)
RFB0
4
CAC1
3
CAC0
2
Reset Value = 0000 0000B
RFA1
1
RFA0
3654A–MICRO–8/09
0