SM565 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
Manufacturer
SM565 Datasheet PDF : 20 Pages
| |||
4-Bit Single-Chip Microcomputer
SM565
HIGHER
ADDRESS
H
LOWER
ADDRESS
L
0
1
2
3
4
5
6
7
8
9
A
B C DE F
0
S0 S16 S32 S48
1
S1 S17 S33 S49
2
S2 S18 S34 S50
3
S3 S19 S35 S51
4
S4 S20 S36 S52
5
S5 S21 S37 S53
6
S6 S22 S38 S54
7
S7 S23 S39 S55
8
S8 S24 S40 S56
9
S9 S25 S41 S57
A
S10 S26 S42 S58
B
S11 S27 S43 S59
C
S12 S28 S44 S60
D
S13 S29 S45 S61
E
S14 S30 S46 S62
F
S15 S31 S47 S63
NOTE: The area with the thick is allocated for a display RAM and the
Sn (n = 0 to 63) shows the related segment outputs.
Figure 4. RAM Configuration
Accumulator (A), Subaccumulator (B) and
Arithmetic and Logic Unit (ALU)
The accumulator (A) is a 4-bit working register which
is the nucleus of the single chip system. It holds the
results of operations and transfers data to memory, I/O
ports and registers.
A subaccumulator (B) is another 4-bit register. It is
used as one of the general purpose registers, and
when combined with the A to form a B-A register pair
allows data transfer on an 8-bit basis.
The arithmetic and logic unit (ALU) performs, in con-
junction with a carry flag (C), binary addition, shift oper-
ations and logical operations such as AND, OR, EX-OR
and complement.
General Purpose Registers (H, L, D, E)
Registers H and L are 4-bit general purpose regis-
ters. They can transfer and compare data with the A on
a 4-bit basis. Registers D and E are 4-bit registers and
can transfer data with the H and L registers on an 8-bit
basis. The H and L as well as the D and E registers can
be combined into 8-bit register pairs, and can be used
as pointers to data memory locations. The L register
can be increment or decremented and is used to
access I/O ports and mode registers.
Clock Divider, IFV Flag, IFA Flag
The device contains a crystal oscillator and a 15-
stage divider as shown in Figure 6. A real-time clock
can be provided by connecting an external crystal oscil-
lator between the oscillator pins. When an external
32.768 kHz crystal oscillator is used, the f0 signal is a
frequency of 1 Hz.
Microcomputer Data Sheet
9
Share Link: 