NJU3502L データシートの表示（PDF） - Japan Radio Corporation

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NJU3502L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3502

• 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 16 pages, and a page consists of 64 bytes memory capacity.

Therefore the NJU3502 prepares the 1024-byte ROM for the application program. The ROM address is

indicated by the Program Counter(PC).

[PROGRAM MEMORY AREA]

( Addresses )

000H

Page0

040H

Page1

080H

Page2

Program Start Address

(Addresses in the page)

00H

64 Instruction Words

380H

3C0H

3FFH

Page14

Page15

3FH

* 8 Bits / Instruction Word

64 Instruction Words / Page

16 Pages / ROM

-6-

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