PCF8563TS Philips Semiconductors, PCF8563TS Datasheet - Page 11

• Manufacturer Part Number: PCF8563TS
• Description: Real-time clock/calendar
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 04855
Product specification
8.6.6 CLKOUT frequency register
8.6.7 Countdown timer registers
Table 23: CLKOUT frequency register bits description (address 0DH)
Table 24: CLKOUT frequency selection
The Timer register is an 8-bit binary countdown timer. It is enabled and disabled via
the Timer control register bit TE. The source clock for the timer is also selected by the
Timer control register. Other timer properties, e.g. interrupt generation, are controlled
via the Control/status 2 register. For accurate read back of the countdown value, the
I
timer clock.
Table 25: Timer control register bits description (address 0EH)
Table 26: Timer source clock frequency selection
Table 27: Timer countdown value register bits description (address 0FH)
Bit
7
6 to 2
1
0
Bit
7
6 to 2
1
0
Bit
7 to 0
2
C-bus clock SCL must be operating at a frequency of at least twice the selected
TD1
FD1
0
0
1
1
0
0
1
1
Symbol
FE
FD1
FD0
Symbol
TE
TD1
TD0
Symbol
<timer countdown value> This register holds the loaded countdown value ‘n’.
16 April 1999
Description
FE = 0; the CLKOUT output is inhibited and the CLKOUT output is
set to high-impedance. FE = 1; the CLKOUT output is activated.
not implemented
These bits control the frequency output (f
pin; see
Description
TE = 0; timer is disabled. TE = 1; timer is enabled.
not implemented
Timer source clock frequency selection bits. These bits determine
the source clock for the countdown timer, see
in use, TD1 and TD0 should be set to ‘11’ (
saving.
TD0
0
1
0
1
FD0
0
1
0
1
Table
Description
Countdown period
Timer source clock frequency (Hz)
4096
64
1
1
24.
60
f
32.768 kHz
1 024 Hz
32 Hz
1 Hz
CLKOUT
=
--------------------------------------------------------- -
Source clock frequency
Real-time clock/calendar
© Philips Electronics N.V. 1999. All rights reserved.
CLKOUT
1
60
Table
PCF8563
Hz) for power
) on the CLKOUT
n
26. When not
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