Rainbow Electronics DS1371 - Manual (Page 8)

DS1371
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Address Map
Table 2 shows the address map for the registers of the DS1371. During a multibyte access, when the
address pointer reaches the end of the register space (08h), it wraps around to location 00h. On a 2-wire
START, STOP, or address pointer incrementing to location 00h, the current time is transferred to a
second set of registers. The time information is read from these secondary registers, while the clock may
continue to run. This eliminates the need to reread the registers in case of an update of the main registers
during a read.
Table 2. Address Map
ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 FUNCTION
00H TOD COUNTER BYTE 0
Time-of-Day
Counter
01H TOD COUNTER BYTE 1
Time-of-Day
Counter
02H TOD COUNTER BYTE 2
Time-of-Day
Counter
03H TOD COUNTER BYTE 3
Time-of-Day
Counter
04H WD/ ALM COUNTER BYTE 0
Watchdog/Alarm
Counter
05H WD/ ALM COUNTER BYTE 1
Watchdog/Alarm
Counter
06H WD/ ALM COUNTER BYTE 2
Watchdog/Alarm
Counter
07H EOSC WACE
WD/
ALM
0 INTCN RS2 RS1 AIE Control
08H OSF 0 0 0 0 0 0 AF Status
Note: Unless otherwise specified, the state of the registers are not defined when power is first applied.