Philips Semiconductors
Product specification
Clock/calendar with 240 × 8-bit RAM
PCF8583
MSB
LSB
0
handbook, full pagewidth
memory location 00
reset state: 0000 0000
7
6
5
4
3
2
1
timer flag (50% duty factor
seconds flag if alarm
enable bit is 0)
alarm flag (50% duty factor
minutes flag if alarm
enable bit is 0)
alarm enable bit:
0
alarm disabled: flags toggle
alarm control register disabled
(memory locations 08 to 0F
are free RAM space)
1
enable alarm control register
(memory location 08 is the
alarm control register)
mask flag:
0
read locations 05 to 06
unmasked
1
read date and month count
directly
function mode :
00 clock mode 32.768 kHz
01 clock mode 50 Hz
10 event-counter mode
11 test modes
hold last count flag :
0
1
count
store and hold last count in
capture latches
stop counting flag :
MRB017
0
1
count pulses
stop counting, reset divider
Fig.3 Control/status register.
1997 Jul 15
6
NXP [ NXP ]
