MSM6242B
FUNCTIONAL BLOCK DIAGRAM
¡ Semiconductor
XT
32.768KHz
XT
OSC
COUNTER
1 Hz
RESET STOP 30 ADJ HOLD BUSY
bit
bit
bit bit
bit
30 sec
ADJ bit
GATE
D
3
D
2
D
1
D
0
WR
RD
A
3
A
2
A
1
A
0
CS
0
ALE
CS
1
24/12bit
MI
1
MI
10
H
1
H
10
W
S
1
S
10
GATE
D
1
D
10
MO
1
MO
10
Y
1
Y
10
64Hz
1-sec carry
1-min carry
1-hour carry
STDP
GATE & LATCH
DECODER
S
1
S
C
F
C
D
C
E
C
F
•
S
1
~W~Y
10
are time counter register
•
C
0
~C
F
are control register
PIN CONFIGURATION
STD.P
CS
0
ALE
A
0
A
1
A
2
A
3
RD
GND
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
V
DD
XT
XT
CS
1
D
0
D
1
D
2
D
3
WR
STD.P
CS
0
NC
ALE
A
0
NC
A
1
NC
A
2
A
3
RD
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
XT
XT
NC
CS
1
D
0
NC
NC
D
1
D
2
D
3
WR
A
0
-A
3
:
D
0
-D
3
:
CS
O
, CS
1
:
RD:
WR:
ALE:
STD.P:
XT,
XT:
V
DD:
V
SS:
Address input
Data input/output
CHIP SELECTS 0,1
READ enable
WRITE enable
Address latch enable
Standard pulse output
XTAL oscillator input/output
+5V supply
ground
18 pin Plastic DIP
24 pin Plastic Small Outline
Package
24
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