PCA8565TS Philips Semiconductors, PCA8565TS Datasheet - Page 6

• Manufacturer Part Number: PCA8565TS
• Description: Real time clock/calender
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Table 6:
Table 7:
9397 750 10695
Product data
Bit
7
6
5
4
3
2 to 0
Bit
7 to 5
4
3
2
1
0
Control/status 1 (address 00H) bits description
Control/status 2 (address 01H) bits description
Symbol
0
Symbol
0
TEST1
0
STOP
0
TESTC
TI/TP
AF
TF
AIE
TIE
8.6.1 Control/status 1 register
8.6.2 Control/status 2 register
Value
0
1
0
1
0
1
Value
0
1
0 (read)
1 (read)
0 (write)
1 (write)
0 (read)
1 (read)
0 (write)
1 (write)
0
1
0
1
Bits TF and AF: When an alarm occurs, AF is set to 1. Similarly, at the end of a timer
countdown, TF is set to 1. These bits maintain their value until overwritten by
software. If both timer and alarm interrupts are required in the application, the source
of the interrupt can be determined by reading these bits. To prevent one flag being
overwritten while clearing another a logic AND is performed during a write access.
Bits TIE and AIE: These bits activate or deactivate the generation of an interrupt
when TF or AF is asserted, respectively. The interrupt is the logical OR of these two
conditions when both AIE and TIE are set.
Description
Normal mode
EXT_CLK test mode
default value is logic 0
RTC source clock runs
all 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 is logic 0
Power-on reset override facility is disabled; set to logic 0 for normal operation
Power-on reset override may be enabled
default value is logic 0
Description
default value is logic 0
INT is active when TF is active (subject to the status of TIE)
INT pulses active according to
AF and AIE are active then INT will be permanently active
alarm flag inactive
alarm flag active
alarm flag is cleared
alarm flag remains unchanged
timer flag inactive
timer flag active
timer flag is cleared
timer flag remains unchanged
alarm interrupt disabled
alarm interrupt enabled
timer interrupt disabled
timer interrupt enabled
Rev. 01 — 31 March 2003
Table 8
(subject to the status of TIE); note that if
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Real time clock/calender
PCA8565
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