PCA8565 查看數據表（PDF） - Philips Electronics
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PCA8565 Datasheet PDF : 26 Pages
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Philips Semiconductors
PCA8565
Real time clock/calender
8.6.1 Control/status 1 register
Table 6:
Bit
7
6
5
4
3
2 to 0
Control/status 1 (address 00H) bits description
Symbol Value
Description
TEST1
0
Normal mode
1
EXT_CLK test mode
0
default value is logic 0
STOP
0
RTC source clock runs
1
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)
0
default value is logic 0
TESTC
0
Power-on reset override facility is disabled; set to logic 0 for normal operation
1
Power-on reset override may be enabled
0
default value is logic 0
8.6.2 Control/status 2 register
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.
Table 7:
Bit
7 to 5
4
3
2
1
0
Control/status 2 (address 01H) bits description
Symbol Value
Description
0
default value is logic 0
TI/TP
0
INT is active when TF is active (subject to the status of TIE)
1
INT pulses active according to Table 8 (subject to the status of TIE); note that if
AF and AIE are active then INT will be permanently active
AF
0 (read) alarm flag inactive
1 (read) alarm flag active
0 (write) alarm flag is cleared
1 (write) alarm flag remains unchanged
TF
0 (read) timer flag inactive
1 (read) timer flag active
0 (write) timer flag is cleared
1 (write) timer flag remains unchanged
AIE
0
alarm interrupt disabled
1
alarm interrupt enabled
TIE
0
timer interrupt disabled
1
timer interrupt enabled
9397 750 10695
Product data
Rev. 01 — 31 March 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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