RV-8564 Datasheet, PDF (9/40 Pages) MICORO CRYSTAL SWITZERLAND – I2C-Bus Interface Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8564
8. REGISTER ORGANIZATION
8.1. REGISTER OVERVIEW
Address
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
Function
Control / Status 1
Control / Status 2
Seconds
Minutes
Hours
Days
Weekdays
Months / Century
Years
Minute Alarm
Hour Alarm
Day Alarm
Weekday Alarm
CLKOUT Frequency
Timer Control
Timer
Bit 7
TEST1
N
VL
X
X
X
X
C
80
AE_M
AE_H
AE_D
AE_W
FE
TE
128
Bit 6
N
N
40
40
X
X
X
X
40
40
X
X
X
X
X
64
Bit 5
STOP
N
20
20
20
20
X
X
20
20
20
20
X
X
X
32
Bit positions labeled as “X” are not implemented.
Bit positions labeled as “N” should always be written with logic 0.
8.2. CONTROL REGISTERS
8.2.1.CONTROL / STATUS 1 (address 00h…bits description)
Address
00h
Function
Control / Status 1
Bit 7
TEST1
Bit 6
N
Bit 5
STOP
Bit 4
N
TI/TP
10
10
10
10
X
10
10
10
10
10
X
X
X
16
Bit 3
TESTC
AF
8
8
8
8
X
8
8
8
8
8
X
X
X
8
Bit 4
N
Bit 3
TESTC
Bit 2
N
TF
4
4
4
4
4
4
4
4
4
4
4
X
X
4
Bit 2
N
Bit 1
N
AIE
2
2
2
2
2
2
2
2
2
2
2
FD1
TD1
2
Bit 1
N
Bit 0
N
TIE
1
1
1
1
1
1
1
1
1
1
1
FD0
TD0
1
Bit 0
N
Bit
7
6
5
4
3
2 to 0
Symbol
TEST1
N
STOP
N
TESTC
N
Value
0¹⁾
1
0²⁾
0¹⁾
1
0²⁾
0
1¹⁾
000²⁾
Description
Must be set to logic 0 for normal operations
Test mode
Default value
RTC source clock runs
RTC divider chain flip-flops are asynchronously set to
logic 0
The RTC clock is stopped (CLKOUT at 32.768 kHz is
still available)
Default value
Must be set to logic 0 for normal operations
Test mode
Default value
Reference
See section 9.5.
1) _{Default value.}
2) _{Bits labeled as “N” should always be written with logic 0.}
Note:
The two bits: TEST1 and TESTC are for device testing. Make sure TEST1 and TESTC are set to 0 during normal
operation. If accidentally set to 1, they may modify the clock data or result in abnormal time.
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