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Alarm timer interrupts
CSR (address 0x00) <- 000001xx - Enable alarm
ACR (address 0x08) <- 01000010 - Enable alarm timer second interrupts
ATIMER (address 0x0F) <- 01100000 - Alarm timer interrupt period (60S)
Timer overflow interrupts
CSR (address 0x00) <- 000001xx - Enable alarm
ACR (address 0x08) <- 00001010 - Enable timer overflow second interrupts
TIMER (address 0x07) <- 99-60 - (60S), must be reloaded in ISR
See datasheet Fig.11
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