Microchip Technology megaAVR 0 Series Manual page 273

21.12.10 Period
Name: PER
Offset: 0x0A
Reset: 0xFF
Property: -
The RTC.PERL and RTC.PERH register pair represents the 16-bit value, PER. The low byte [7:0] (suffix
L) is accessible at the original offset. The high byte [15:8] (suffix H) can be accessed at offset + 0x01. For
more details on reading and writing 16-bit registers, refer to Accessing 16-bit Registers in the CPU
chapter.
Due to synchronization between the RTC clock and system clock domains, there is a latency of two RTC
clock cycles from updating the register until this has an effect. Application software needs to check that
the PERBUSY flag in RTC.STATUS is cleared before writing to this register.
Bit 15
Access
R/W
Reset 1
Bit 7
Access
R/W
Reset 1
Bits 15:8 – PER[15:8] Period High Byte
These bits hold the MSB of the 16-bit Period register.
Bits 7:0 – PER[7:0] Period Low Byte
These bits hold the LSB of the 16-bit Period register.
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2018 Microchip Technology Inc.
14 13
R/W R/W
1 1
6 5
R/W R/W
1 1
12 11
PER[15:8]
R/W R/W
1 1
4 3
PER[7:0]
R/W R/W
1 1
Datasheet Preliminary
®
megaAVR 0-Series
Real-Time Counter (RTC)
10 9
R/W R/W
1 1
2 1
R/W R/W
1 1
DS40002015A-page 273
8
R/W
1
0
R/W
1