em3027 EM Microelectronic, em3027 Datasheet - Page 10

• Manufacturer Part Number: em3027
• Description: Real-time Clock With I2c Or Spi Interface, Crystal Temperature Compensation, Battery Switchover And Trickle Charger
• Manufacturer: EM Microelectronic

Notes and Settings:
Control Page - Register OnOffCtrl
Control Page - Register IRQctrl
Control Page - Register IRQflags
Control Page - Register Status
Control Page - Register RstCtrl
Watch Page - Registers Watch Seconds, Watch Minutes, Watch Hours, Watch Date, Watch Days, Watch Months,
Watch Years
Alarm Page - Registers Alarm Seconds, Alarm Minutes, Alarm Hours, Alarm Date, Alarm Days, Alarm Months,
Alarm Years
Copyright © 2008, EM Microelectronic-Marin SA
07/08 – rev B
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- Only pages 0 to 7 are used. Unused pages are dedicated for a future use and test purposes. The application
- The XtalOffset must be set to within ± 127 ppm.
- Zero values are read from unused locations.
- Watch, Alarm, Timer pages have to be set by an application before use.
- The bit 7 (MSB) of the Alarm Registers (SecEq, MinEq.) are to be set to ‘1’ to perform the comparison. (See
- The bit 7 (MSB) of the address is always zero and its value is, therefore, ignored during read/write operation.
Definitions of terms in the memory mapping
should not write into unused page and addresses
Paragraph 8.3)
Clk/Int
TD0, TD1
SROn
EERefOn
TROn
TiOn
WaOn
SRIntE
V2IntE
V1IntE
TIntE
AIntE
SRF
V2F
V1F
TF
AF
NOTE: Flags can be cleared by ‘0’ writing.
EEBusy
PON
SR
VLOW2
VLOW1
SYSRes
Watch information (BCD format)
S12/24
PM/2
Alarm information (BCD format)
PM/2
R
Selects if clock or interrupt is applied onto the IRQ/CLKOUT pin (’0’ = IRQ output; ’1’ = CLKOUT
output) - CLKOUT is the default state after reset
Selects decrement rates for Timer (32 Hz after reset)
Enables Self-Recovery function (ON after reset)
Enables Configuration Registers refresh each 1 hour (ON after reset);
Enables Timer Auto-reload mode (‘0’ – reload disabled; ‘1’ – reload enabled)
Enables Timer (OFF after reset)
Enables 1 Hz clock for Watch (ON after initialisation)
Self-Recovery interrupt enable
VLOW2 interrupt enable
VLOW1 interrupt enable
Timer interrupt enable
Alarm interrupt enable
Self-Recovery interrupt flag (bit is set to ‘1’ when Self-Recovery reset is generated)
VLOW2 interrupt flag (bit is set to ‘1’ when power drops below Vlow2)
VLOW1 interrupt flag (bit is set to ‘1’ when power drops below Vlow1)
Timer interrupt flag (bit is set to ‘1’ when Timer reaches ZERO)
Alarm interrupt flag (bit is set to ‘1’ when Watch matches Alarm)
EEPROM is busy (bit is set to ‘1’ when EEPROM write or Configuration Registers refresh is in
progress) (Read Only)
Power ON (bit is set to ‘1’ just during Power On; clear by ‘0’ writing)
Self-Recovery reset or System reset detected (clear by ‘0’ writing)
Voltage level V
Voltage level V
System reset register; writing ‘1’ will initiate restart of the logic (Watch, Alarm and Timer parts
excluded). After the restart, status bit SR is set. The register is cleared after restart of the logic.
Run watch in 12-hours format S12/24 = ‘1’ or 24-hours S12/24 = ‘0’
S12/24 = ‘0’ PM/2 represents 2 tens,
S12/24 = ’1’ PM/2 = ‘1’ represents PM (afternoon), PM/2 =’0’ represents AM (morning)
S12/24 = ‘0’ PM/2 represents 2 tens,
S12/24 = ’1’ PM/2 = ‘1’ represents PM (afternoon), PM/2 =’0’ represents AM (morning)
CC
CC
or V
or V
Back
Back
below Vlow2 (clear by ‘0’ writing)
below Vlow1 (clear by ‘0’ writing)
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EM3027