AT89LP213_06 Datasheet, PDF (56/90 Pages) ATMEL Corporation – 8-bit Microcontroller with 2K Bytes Flash

Table 19-1. ACSR – Analog Comparator Control & Status Register
ACSR = 97H
Not Bit Addressable
–
–
CIDL
CF
CEN
Bit
7
6
5
4
3
Reset Value = XXX0 0000B
CM3
2
CM1
1
CM0
0
Symbol Function
CIDL
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.
CF
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.
CEN
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.
CM [2:0] Comparator Interrupt Mode
CM2 CM1 CM0 Interrupt Mode
0
0
0
Negative (Low) level
0
0
1
Positive edge
0
1
0
Toggle with debouncing⁽¹⁾
0
1
1
Positive edge with debouncing⁽¹⁾
1
0
0
Negative edge
1
0
1
Toggle
1
1
0
Negative edge with debouncing⁽¹⁾
1
1
1
Positive (High) level
Note: 1. Debouncing modes require the use of Timer 1 to generate the sampling delay.
56 AT89LP213/214 [Preliminary]
3538A–MICRO–7/06