RV-8564 Datasheet, PDF (15/40 Pages) MICORO CRYSTAL SWITZERLAND – I2C-Bus Interface Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8564
8.6.1.TIMER CONTROL (address 0Eh…bits description)
Address
0Eh
Function
Timer Control
Bit 7
TE
Bit 6
X
Bit 5
X
Bit 4
X
Bit 3
X
Bit 2
X
Bit 1
TD1
Bit 0
TD0
Bit
7
6 to 2
1 to 0
Symbol
TE
X
TD[1:0]
Value
0¹⁾
1
-
00 to 11¹⁾
Description
Timer is disabled
Timer is enabled
Unused
Timer source clock frequency selection²⁾
Timer Frequency
4096 Hz
64 Hz
1 Hz
1_{/60 Hz}
Bit 7
X
X
X
X
Bit 6
X
X
X
X
Bit 5
X
X
X
X
Bit 4
X
X
X
X
Bit 3
X
X
X
X
Bit 2
X
X
X
X
Bit 1
0
0
1
1
Bit 0
0
1
0
1
1) _{Default value.}
2) _{These bits determine the source clock frequency for the countdown timer. When not in use, TD1 / TD0 should be set to 1/60 Hz for power}
saving.
8.6.2.TIMER (address 0Fh…bits description)
Address
0Fh
Function
Timer
Bit 7
128
Bit 6
64
Bit 5
32
Bit 4
16
Bit 3
8
Bit 2
4
Bit 1
2
Bit 0
1
Bit
7 to 0
Symbol
Timer
Value
00h to FFh
Description
Countdown value = n
Countdown Period =
n
Source Clock Frequency
Note:
For accurate read back of the countdown value, the I²C bus clock (SDA) must be operating at a frequency of at
least twice the selected timer clock. Since it is not possible to freeze the countdown timer counter during read back,
it is recommended to read the register twice and check for consistent results.
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