AT89S2051 Atmel Corporation, AT89S2051 Datasheet - Page 19

• Manufacturer Part Number: AT89S2051
• Manufacturer: Atmel Corporation

Specifications of AT89S2051

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 15
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 2
• Isp: SPI

20. Analog Comparator Register
Table 20-1.
3390E–MICRO–6/08
Symbol
CF
CEN
CM [2:0]
ACSR = 97H
Not Bit Addressable
Bit
Function
Comparator Interrupt Flag. Set when the comparator output meets the conditions specified by the CM [2:0] bits and CEN
is set. The flag must be cleared by software. The interrupt may be enabled/disabled by setting/clearing bit 6 of IE.
Comparator Enable. Set this bit to enable the comparator. Clearing this bit will force the comparator output low and
prevent further events from setting CF.
Comparator Interrupt Mode
ACSR
--- ---- ----
2
0
0
0
0
1
1
1
1
–
7
1
0
0
1
1
0
0
1
1
– Analog Comparator Control & Status Register
0
0
1
0
1
0
1
0
1
.
–
6
Interrupt Mode
---------------------------------------
Negative (Low) level
Positive edge
Toggle with debounce
Positive edge with debounce
Negative edge
Toggle
Negative edge with debounce
Positive (High) level
–
5
CF
4
CEN
3
CM2
2
AT89S2051/S4051
Reset Value = XXX0 0000B
CM1
1
CM0
0
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