RS5C372B-E2(1997) View Datasheet(PDF) - RICOH Co.,Ltd.
Part Name
Description
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RS5C372B-E2 Datasheet PDF : 39 Pages
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RS5C372B
2. Functions of Registers
2.1. Control Register 1 (Internal address at Eh)
D7
D6
D5
D4
D3
D2
D1
D0
AALE BALE 0 *1) 0 *1) TEST CT2
CT1
CT0 (For write operation)
AALE BALE
0
0
TEST CT2
CT1
CT0 (For read operation)
0
0
0
0
0
0
0
0 Default *2)
*1) These bits must be set “0” in any case.
*2) The default means read values when XSTP=”1” by after initial power-on or supply voltage drop,etc.
2.1.1. AALE,BALE
AALE,BALE
0
1
Alarm_A, Alarm_B enable bit
Description
Alarm_A (Alarm_B) correspondence action invalid
Alarm_A (Alarm_B) correspondence action valid
(Default)
2.1.2. TEST
Test bit
TEST
Description
0
Ordinary operation mode
1
Test mode
The test bit is used for IC test. Set the TEST bit to 0 in ordinary operation.
(Default)
2.1.3. CT2,CT1,CT0 Periodic interrupt frequency select bit
CT2 CT1 CT0
Description
Wave form
Frequency and falling timing
mode
0
0
0
-
OFF(H)
(Default)
0
0
1
-
Fixed at “L”
0
1
0 Pulse mode 2Hz(Duty50%)
0
1
1 Pulse mode 1Hz(Duty50%)
1
0
0 Level mode Every second (synchronized with second
count up)
1
0
1 Level mode Every minute (00 second of every minute)
1
1
0 Level mode Every hour ( 00 minute(s) 00 second(s) of
every hour )
1
1
1 Level mode Every month (the 1st day 00 AM 00
minute(s) 00 second(s) of every month )
1) Pulse mode: Outputs 2Hz, 1Hz clock pulses. For relationships with counting up of seconds, see the diagram
on the next page.
*) When 32000Hz crystal is used
In the 2Hz clock pulse mode, 0.496s clock pulses and 0.504s clock pulse are output alternately. Duty cycle for
1Hz clock pulses becomes 50.4% (“L” duration is 0.496s while “H” duration is 0.504s).
2) Level mode: One second, one minute or one month may be selected for an interrupt frequency. Counting up of
seconds is matched with falling edge of interrupt output.
3) When the clock error correction circuit is used, periodic interrupt frequency changes every 20 seconds.
Pulse mode: “L” duration of output pulses may change in the maximum range of ±3.784ms (±3.875ms when
32.000kHz crystal is used.) For example, Duty will be 50±0.3784% (or 50±0.3875% when 32.000kHz crystal is
used) at 1Hz.
Level mode: Frequency in one second may change in the maximum range of ±3.784ms (±3.875ms when
32.000kHz crystal is used.)
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