NJU3503L データシートの表示（PDF） - Japan Radio Corporation

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NJU3503L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3503

• STATUS flag(ST)

STATUS flag(ST) is the conditional flag in accordance with the result of the instruction execution. Its

condition is in accordance with follows:

1) to be same as CY flag condition.

2) to be set the condition to "0"(ST=0) when the result of the logical calculation(AND, OR, XOR,

YNEA) is zero.

3) to be set the condition to "0"(ST=0) when the result of the comparison(CMP) is zero.

However, ST flag condition is always set to "1"(ST=1) except above three.

ST flag controls the branch operation. Branch instruction does not branch when ST flag condition is "0",

and branches when ST flag condition is "1". ST flag condition is kept until the end of the next instruction

executing cycle.

The ST flag condition is unknown on the “RESET” operation.

(3) FUNCTIONAL BLOCK

• ARITHMETIC LOGIC UNIT(ALU)

ARITHMETIC LOGIC UNIT(ALU) is a 4-bit binary paralleled calculation circuit operating binary addition,

binary subtraction, comparison, logical AND, logical OR, exclusive OR, and SHIFT(Rotation). And it also

can detect CARRY, BORROW or ZERO in accordance with the result of each calculation.

• PROGRAM MEMORY(ROM)

PROGRAM MEMORY(ROM) consists of 32 pages, and a page consists of 64 bytes memory capacity.

Therefore the NJU3503 prepares the 2048-byte ROM for the application program. The ROM address is

indicated by the Program Counter(PC).

[PROGRAM MEMORY AREA]

(Address)

000H

Page0

040H

080H

Page1

Page2

780H

7C0H

7FFH

Page30

Page31

(Addresses in the page)

00H

64Instruction Words

3FH

* 8 Bits / Instruction Word

64 Instruction Words / Page

32 Pages / ROM

-8-

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