rtc-4553ac Epson Electronics America, Inc., rtc-4553ac Datasheet - Page 13

• Manufacturer Part Number: rtc-4553ac
• Description: Real Time Clock Module
• Manufacturer: Epson Electronics America, Inc.

RTC – 4553AC
8.2.2. Control Registers
(1) Control register 1
(c) CNTR bit (D1)
(d) 24/12 bit (D0)
(b) 30ADJ bit (D2)
(a) TPS bit (D3)
Control register 1 performs 12-hour/24-hour display format switching, digit counter reset, 30 second
adjustment, and timing pulse signal switching. The register allows data read and write.
When "1" was written to the 30ADJ bit, the bit automatically resets itself to "0" within 76.3 s The 30 second
adjustment function also resets fractions below full seconds. The TP
cycle only during 30 second adjustment.
When CNTR is used to reset the seconds, fractions below full seconds are also reset. The TP
Hz duty changes for one cycle only during reset.
The TPS bit selects the timing pulse output waveform.
1/10 Hz is not output for 10 seconds after power-on or system reset (output is "L").
When "1" is written to this bit, one of the following reset operations is carried out.
The CNTR bit resets the time/calendar counters.
The 24/12 bit serves to switch between 12-hour and 24-hour format.
* PM/AM bit: This bit is output also when 24-hour format is selected.
* Time keeping is not affected also when the 12-hour/24- hour format is switched during clock operation.
A3
* For counters other than the year, selecting either the 1 or the 10 digit counter will reset both counters.
1
CNTR bit
TPS bit
Seconds digit before
30 seconds or more
29 seconds or less
0 (12-hour format)
1 (24-hour format)
0
1
0
1
adjustment
A2
24/12 bit
1
1024 Hz (976.5 s)
Frequency (cycle)
Normal mode (time/calendar counters can be incremented)
A1
1/10 Hz (10 s)
0
A0
1
Seconds reset to "00" with carry to 1-minute digit
Seconds reset to "00" without carry to 1-minute
AM 12:00 to AM 11:59, PM 12:00 to PM 11:59
AM 00:00 to AM 11:59, PM 12:00 to PM 23:59
Selected counter is reset to "0"
CNT 1
Name
Seconds digit after adjustment
TPS
Content
D3
Page - 10
Displayed time
30ADJ CNTR
1/2 (488.28 s)
"L" level duty
D2
digit
3/5 (6 s)
D1
24/12
D0
OUT
1/10 Hz duty changes for one
Register contents
Control register 1
MQ - 342 - 01
OUT
1/10