AS8218 datasheet(41/123 Pages) AMSCO

41 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 41 of 123

Control / Status 1 Register (9110h)

MSB

LSB

WAIT

Bit

Symbol Function

Not used

WAIT

Indicates that RTC is waiting for a start signal. The start signal is WAIT being reset to 0.

WAIT = 0

RTC running normally. (Clear by MCU.)

WAIT = 1

Is set when time/calendar information is changed (access to registers 9100h to 9106h).

While RTC is waiting for a start signal, 1Hz clock is still gated to the MPIOs.

Not used

return zero value. Writing these bits has no effect.)

Control / Status 2 Register (9111h)

MSB

LSB

TSA

A2F

A1F

STF

AIE2

AIE1

SIE

Bit

Symbol Function

TSA

Time Setting Alarm: Indicates when an impossible time/date has been set and it has been corrected by

the RTC automatically, e.g. 31

st February

st February.

An interrupt will be generated and TSA is set to 1. The interrupt is cleared by setting TSA=0 (done by

MCU (software)).

Not used

A2F

Set to logic 1 when an alarm 2 occurs and maintains this value until software clears it. Indicates the

source of the interrupt. Cannot be set by software. When the flag is cleared, also the interrupt is cleared.

A1F

Set to logic 1 when an alarm 1 occurs and maintains this value until software clears it. Indicates the

source of the interrupt. Cannot be set by software. When the flag is cleared, also the interrupt is cleared.

STF

Set to logic 1 when a seconds timer interrupt occurs and maintains this value until software clears it.

Indicates the source of the interrupt. Cannot be set by software. When the flag is cleared, also the

interrupt is cleared.

AIE2

AIE2 = 0; alarm 2 interrupt disabled

AIE2 = 1; alarm 2 interrupt enabled

AIE1

AIE1 = 0; alarm 1 interrupt disabled

AIE1 = 1; alarm 1 interrupt enabled

SIE

SIE = 0; seconds counter interrupt disabled

SIE = 1; seconds counter interrupt enabled

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