DS1386 DALLAS [Dallas Semiconductor], DS1386 Datasheet - Page 9

• Manufacturer Part Number: DS1386
• Description: RAMified Watchdog Timekeeper
• Manufacturer: DALLAS [Dallas Semiconductor]

TIME OF DAY ALARM MASK BITS Figure 3
NOTE:
Any other bit combinations of mask bit settings produce illogical operation.
COMMAND REGISTER
Address location 0Bh is the Command Register where mask bits, control bits and flag bits reside. The
operation of each bit is as follows:
TE - Bit 7 Transfer Enable-This bit when set to a logic 0 will disable the transfer of data between internal
and external clock registers. The contents in the external clock registers are now frozen and reads or
writes will not be affected with updates. This bit must be set to a logic 1 to allow updates.
IPSW - Bit 6 Interrupt Switch-When set to a logic 1,
is the Watchdog Alarm. When set to logic 0, this bit reverses the output pins.
alarm output and INTB/(
IBH/LO - Bit 5 Interrupt B Sink or Source Current-When this bit is set to a logic 1 and V
INTB/(
will sink current (see DC characteristics IOL).
PU/LVL - Bit 4 Interrupt Pulse Mode or Level Mode - This bit determines whether both interrupts will
output a pulse or level signal. When set to a logic 0,
When this bit is set to a logic 1, the pulse mode is selected and
3 ms and then release. INTB/(
Bit 5, for a minimum of 3 ms and then release. INTB will only source current when there is a voltage
present on V
WAM - Bit 3 Watchdog Alarm Mask - When this bit is set to a logic 0, the watchdog interrupt output
will be activated. The activated state is determined by bits 1,4,5, and 6 of the COMMAND REGISTER.
When this bit is set to a logic 1, the watchdog interrupt output is deactivated.
TDM - Bit 2 Time of Day Alarm Mask - When this bit is set to a logic 0, the time of day alarm interrupt
output will be activated. The activated state is determined by bits 0,4,5, and 6 of the COMMAND
REGISTER. When this bit is set to a logic 1, the time of day alarm interrupt output is deactivated.
(3) MINUTES
INTB
1
0
0
0
CC
) will source current (see DC characteristics IOH). When this bit is set to a logic 0, INTB
.
REGISTER
(5) HOURS
INTB
1
1
0
0
) is the time of day alarm output.
INTB
) will either sink or source current, depending on the condition of
(7) DAYS
1
1
1
0
9 of 20
INTA
INTA
ALARM ONCE PER MINUTE
ALARM WHEN MINUTES MATCH
ALARM WHEN HOURS AND MINUTES
MATCH
ALARM WHEN HOURS, MINUTES AND
DAYS MATCH
and INTB/(
is the Time of Day Alarm and INTB/(
INTA
will sink current for a minimum of
INTB
) will be in the level mode.
INTA
is now the watchdog
CC
is applied,
INTB
)