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參數(shù)資料
| 型號(hào)： | RF5C62 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | REAL-TIME CLOCK |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| 封裝： | SOP-18 |
| 文件頁數(shù)： | 6/48頁 |
| 文件大?。?/td> | 419K |
| 代理商： | RF5C62 |
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Function
CS and CE are used when interfacing external devices. They may be accessed
when CS is low and CE is high. CE is connected to an output of power down
detector on the system power supply side, and CS is connected to the microcom-
puter address bus.
Timer output may be used as an interrupt free-run timer or watchdog timer.
When CE is low (running on battery backup), operation stops (there is no output).
It is N-ch open drain output.
Address input is connected to the CPU address bus. It is gated internally with CE.
When RD falls from high to low, the contents of the counters or registers specified
by A0 to A3 are output to D0 to D3. It is valid when CS is low and CE is high. It is
CMOS input.
When WR falls from high to low or rises from low to high, the contents of D0 to
D3 are written to registers or counters specified by A0 to A3. WR is valid when CS
is low and CE is high. It is CMOS input.
D0 to D3 are connected to the CPU data bus. The input section is gated internally
with CE. It is CMOS input/output.
INTR outputs cyclic interrupts or alarm interrupts to CPU. It also operates when
CE is low (at battery backup). It is N-ch open drain output.
Crystal oscillator of 32.768kHz must be connected between OSCIN and OSCOUT.
Capacitance is connected externally between V
DD
and OSCIN and V
DD
and
OSCOUT, forming the oscillator circuit.
V
DD
connects to +5V or +3V and V
SS
to ground.
2
PIN CONFIGURATION
RP5C62 (18pin DIP)
RP/RF/RS5C62
VDD
OSCOUT
OSCIN
VDD
OSCOUT
OSCIN
INTR
D3
D2
D1
D0
WR
D3
D2
D1
D0
WR
INTR
CS
CE
TMOUT
A1
A2
A3
RD
VSS
A0
1
2
3
5
6
7
8
9
4
18
17
16
14
13
12
11
10
15
CE
A0
A1
A2
A3
RD
VSS
18
17
16
15
14
13
12
11
10
1
2
3
4
5
6
7
8
9
CS
TMOUT
VDD
OSCOUT
OSCIN
NC
INTR
D3
D2
D1
D0
WR
CS
CE
TMOUT
NC
A0
A1
A2
A3
RD
VSS
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
PIN DESCRIPTION
Pin No.
Symbol
Name
1
2
CS
CE
Chip select input
Chip enable input
3
TMOUT
Timer output
4–7
A0–A3
Address input
8
RD
Read control input
10
WR
Write control input
11–14
D0–D3
Bi-directional data
bus
15
INTR
Interrupt output
16
17
OSCIN
OSCOUT
Oscillator circuit
input/output
18
9
V
DD
V
SS
Power supply
*
) The pin numbers marked in the above table indicate the pins on the 18pin packages.
RF5C62 (18pin SOP)
RS5C62 (20pin SSOP)
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