AT89LP214 Atmel Corporation, AT89LP214 Datasheet - Page 57

• Manufacturer Part Number: AT89LP214
• Manufacturer: Atmel Corporation

Specifications of AT89LP214

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 12
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.125
• Operating Voltage (vcc): 2.4 to 5.0
• Timers: 2
• Isp: SPI/OCD
• Watchdog: Yes

Table 19-1.
Note:
Figure 19-1. Negative Edge with Debouncing Example
3538E–MICRO–11/10
Symbol
CIDL
CF
CEN
CM [2:0]
ACSR = 97H
Not Bit Addressable
Bit
1. Debouncing modes require the use of Timer 1 to generate the sampling delay.
Function
Comparator Idle Enable. If CIDL = 1 the comparator will continue to operate during Idle mode. If CIDL = 0 the
comparator is powered down during Idle mode. The comparator is always shut down during Power-down mode.
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. When CEN = 1 the analog input pins, P1.0 and P1.1, have their digital inputs
disabled.
Comparator Interrupt Mode
CM2
0
0
0
0
1
1
1
1
ACSR
–
7
– Analog Comparator Control & Status Register
CM1
0
0
1
1
0
0
1
1
Timer 1 Overflow
Comparator Out
CM0
0
1
0
1
0
1
0
1
–
6
CF
Start
Interrupt Mode
Negative (Low) level
Positive edge
Toggle with debouncing
Positive edge with debouncing
Negative edge
Toggle
Negative edge with debouncing
Positive (High) level
CIDL
5
Compare
CF
4
(1)
Start
(1)
(1)
CEN
3
Compare
CM3
2
Reset Value = XXX0 0000B
AT89LP213/214
CM1
1
CM0
0
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