RP5C01A

Manufacturer Part NumberRP5C01A
DescriptionReal time clock with internal RAM.
ManufacturerRICOH Co.,Ltd.
RP5C01A datasheet
 


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RP/RF5C01A
OUTLINE
The RP/RF5C01A are real-time clocks for microcomputers that can be connected directly to buses of microcom-
puters with such CPUs as the 8085A or Z80 and allow setting or reading of the clock with the same procedures as
for the Read/Write operation for memory.
These products have various features such as clock and calendar counters, alarm functions, and 26
which can be backed up by batteries. They can then be used as non-volatile RAM.
FEATURES
• Connected directly to CPU
• 4bit bidirectional data bus : D0 - D3
• Built-in clock counter (hour, minute, second) and calendar counter (leap year, year, month, day, day-of-the-week)
• Supports both 12-hour AM/PM clock and 24-hour clock
• All clock data expressed in BCD codes
• Backed up by batteries (minimum:2.2V)
• Outputs alarm signals or timing pulse of 16Hz or 1Hz.
• Packages : 18pin DIP (RP5C01A) ; 18pin SOP(RF5C01A)
BLOCK DIAGRAM
OSCIN
15
OSC
1/2
OSCOUT
ADJ
CS
CLOCK
CS
HOLD
RD
WR
ADJ
HOLD
CONTROLLER
REAL-TIME CLOCK
WITH INTERNAL RAM
• ±30 second adjustment function
´
• Built-in 26
4bits RAM
1H
,16H
,
z
z
S
S
S
S
S
S
S
2
3
4
5
6
7
8
4
3
4
2
3
4
2
T-RESET
ALARM REGISTER
RD.WR.
MODE01
A-RESET
COMPARATOR
RD. WR.
MODE 00
SECONDS MINUTES
HOURS
DAYS
MONTHS
1
1
1
1
1
1
1
1
1
1
/
/
/
/
/
/
/
/
-
/
/
10
6
10
6
12
24
7
28
31
12
S1 S2 S3 S4 S5 S6 S7 S8 S9 SA SB SC
S0
4
3
4
3
4
2
3
4
2
4
1
4
4
4
SO
INTERNAL
ADDRESS
BUS
DECODER
CONTROL
SD
BUFFER
SF
-SF
A
A
A
A
D
D
D
D
0
1
2
3
0
1
2
3
NO. EK-086-9804
´
4bits RAM
• 4bit address input : A0 - A3
ALARM
ALARM
ALARM
OUTPUT
YEARS
1
1
1
/
/
/
10
10
4
RD.WR.
MODE10,MODE11
4
2
SO-SC
´
26
4bits
BUS
RAM
1

RP5C01A Summary of contents