TMP47C990E TOSHIBA [Toshiba Semiconductor], TMP47C990E Datasheet - Page 5

• Manufacturer Part Number: TMP47C990E
• Description: CMOS 4-bit Microcontroller
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

TOSHIBA CORPORATION
2.2 Program Memory (ROM)
Programs and fixed data are stored in the program memory.
The instruction to be executed next is read from the address
indicated by the contents of the PC.
structions.
• Table look-up instructions
2.2.1 Program Memory Capacity
The 47C101 has 1024 x 8 bits (addresses 000
of program memory (mask ROM), the 47C201 has 2048 x 8
bits (addresses 000
The fixed data can be read by using the table look-up in-
[LDL A, @DC], [LDH A, @DC+]
The table look-up instructions read the lower and
upper 4 bits of the fixed data stored at the address
H
through 7FF
H
).
Figure 2-2. Configuration of Program Memory
H
through 3FF
H
)
2.2.2 Program Memory Map
Figure 2-3 shows the program memory map. Address 000
086
poses. On the 47C101, no physical program memory exists in
the address range 400
is accessed by program, the most significant bit of each
address is always regarded as “0” and the contents of the pro-
gram memory corresponding to the address is always
regarded as “0” and the contents of the program memory cor-
responding to the address 000
H
of the program memory are also used for special pur-
specified in the data counter (DC) to place them into
the accumulator. [LDL A, @DC] instruction reads the
lower 4 bits of fixed data, and [LDH A, @DC+] instruc-
tion reads the upper 4 bits.
The DC is a 12-bit register, allowing it to address the
entire program memory space.
Example: When [LDL A, @DC] instruction is executed
with the DC value being 7AO
“8” is stored in the accumulator; when [LDH
A, @DC+] instruction is executed, “5” is
stored in the accumulator and the DC value
is incremented to 7A1
H
through 7FF
H
through 3FF
H
. However, if this space
H
.
TMP47C101/201
H
H
are read.
being 58
H
5/32
H
,
-