pca8565a NXP Semiconductors, pca8565a Datasheet - Page 7

• Manufacturer Part Number: pca8565a
• Description: Real-time Clock/calendar
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 5.
[1]
[2]
Table 6.
[1]
[2]
PCA8565A_2
Product data sheet
Bit
7
6
5
4
3
2 to 0
Bit
7 to 5
4
3
2
1
0
Default value.
Bits labeled as N should always be written with logic 0.
Bits labeled as N should always be written with logic 0.
Default value.
Symbol
TEST1
N
STOP
N
TESTC
N
Symbol
N
TI_TP
AF
TF
AIE
TIE
Control_status_1 - control and status register 1 (address 00h) bit description
Control_status_2 - control and status register 2 (address 01h) bit description
8.3.1 Register Control_status_1
8.3.2 Register Control_status_2
8.3 Control registers
Value
0
1
0
0
1
0
0
1
000
Value
000
0
1
0
1
0
1
0
1
0
1
[1]
[2]
[1]
[2]
[1]
[2]
[2]
[2]
[2]
[2]
[2]
[1]
Description
normal mode;
EXT_CLK test mode
default value
RTC clock runs
RTC clock is stopped;
default value
Power-On Reset (POR) override facility is disabled;
Power-On Reset (POR) override is enabled
default value
Description
default value
INT active when TF or AF is active (subject to the status of TIE and AIE)
INT pulses active according to
read: alarm flag inactive
write: alarm flag is cleared
read: alarm flag active
write: alarm flag remains unchanged
read: timer flag inactive
write: timer flag is cleared
read: timer flag active
write: timer flag remains unchanged
alarm interrupt disabled
alarm interrupt enabled
timer interrupt disabled
timer interrupt enabled
must be set logic 0 during normal operations
all RTC divider chain flip-flops are asynchronously set logic 0;
the RTC clock is stopped (CLKOUT at 32.768 kHz is still available);
I
set logic 0 for normal operation
Remark: if AF and AIE are active then INT will be permanently active
2
C-bus watchdog doesn’t work
Rev. 02 — 4 December 2009
Table 9
(subject to the status of TIE);
Real-time clock/calendar
PCA8565A
© NXP B.V. 2009. All rights reserved.
Reference
Section 8.9
Section 8.10
Section 8.11.1
Reference
Section 8.3.2.1
and
Section 8.8
Section 8.3.2.1
Section 8.3.2.1
Section 8.3.2.1
Section 8.3.2.1
7 of 38