Rainbow-electronics AT89LP214 Manual de usuario descargar pdf (Pagina 56)

3538A–MICRO–7/06

AT89LP213/214 [Preliminary]

Note: 1. Debouncing modes require the use of Timer 1 to generate the sampling delay.

Table 19-1. ACSR – Analog Comparator Control & Status Register

ACSR = 97H Reset Value = XXX0 0000B

Not Bit Addressable

––

CIDL CF CEN CM3 CM1 CM0

Bit76543210

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

000Negative (Low) level

001Positive edge

010Toggle with debouncing

(1)

011Positive edge with debouncing

(1)

100Negative edge

101Toggle

110Negative edge with debouncing

(1)

111Positive (High) level

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Rainbow-electronics AT89LP214 Manual de usuario Pagina 56