RV-8564 Datasheet, PDF (14/40 Pages) MICORO CRYSTAL SWITZERLAND – I2C-Bus Interface Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8564
8.4.4.WEEKDAY ALARM (address 0Ch…bits description)
Address
0Ch
Function
Weekday Alarm
Bit 7
AE_W
Bit 6
X
Bit 5
X
Bit 4
X
Bit 3
X
Bit 2
4
Bit 1
2
Bit 0
1
Bit
7
6 to 3
2 to 0
Symbol
AE_W
X
Weekday Alarm
Value
0
1¹⁾
-
0 to 6
Description
Weekday Alarm in enabled
Weekday Alarm is disabled
Unused
Weekday Alarm information coded in BCD format
1) _{Default value.}
8.5. CLKOUT REGISTER
A programmable square wave output is available at CLKOUT pin. Operation is controlled by the FE bit in register
CLKOUT Frequency and Clock Output Enable pin (CLKOE). To enable CLKOUT, CLKOE pin must be set HIGH.
Frequencies of 32.768 kHz (default), 1024 Hz, 32 Hz and 1 Hz can be generated for use as a system clock,
microcontroller clock, input to a charge pump, or for calibration of the oscillator.
8.5.1.CLKOUT FREQUENCY (address 0Dh…bits description)
Address
0Dh
Function
CLKOUT Frequency
Bit 7
FE
Bit 6
X
Bit 5
X
Bit 4
X
Bit 3
X
Bit 2
X
Bit 1
FD1
Bit 0
FD0
Bit
7
6 to 2
1 to 0
Symbol
FE
X
FD[1:0]
Value
0
1¹⁾
-
00¹⁾ to 11
Description
The CLKOUT output is inhibited and set to logic 0
The CLKOUT output is activated
Unused
CLKOUT Frequency selection
CLKOUT Frequency
32.768 kHz
1024 Hz
32 Hz
1 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.}
8.6. TIMER REGISTER
The 8-bit countdown timer register at address 0Fh is controlled by the timer control register at address 0Eh. The
Timer Control register determines one of 4 source clock frequencies for the timer (4096 Hz, 64 Hz, 1 sec, or 1/60
Hz) and enables / disables the timer. The timer counts down from a software loaded 8-bit binary value. At the end
of every countdown, the timer sets the Timer Flag TF to logic 1. The TF may only be cleared using the interface.
The generation of interrupts from the timer function is controlled via bit TIE (Control / Status 2 register). If bit TIE is
enabled, the INT pin follows the condition of bit TF. The interrupt may be generated as a pulsed signal every
countdown period or as a permanent active signal which follows the condition of the Timer Flag TF. TI/TP (Control /
Status 2 register) is used for this mode control. When reading the timer, the current countdown value is returned.
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