UPD17062 datasheet(39/296 Pages) NEC

부품명	UPD17062

상세설명	4-BIT SINGLE-CHIP MICROCONTROLLER CONTAINING PLL FREQUENCY SYNTHESIZER AND IMAGE DISPLAY CONTROLLER

PDF	296 Pages

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제조업체	NEC [NEC]

홈페이지	http://www.nec.com/

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µPD17062

Example 2.

5.3.2

Notes on Using Unmounted Data Memory

As shown in Fig. 5-6, nothing is actually assigned to bit 0 (LSB) of address 72H of BANK1 of the port registers.

If a data memory manipulation instruction is executed for this address, the following operations are

performed:

(1) Device behavior

If a read instruction is executed, a 0 is read.

Executing a write instruction results in no change.

(2) Assembler behavior

Normal assembly is performed.

No error occurs.

(3) Emulator (IE-17K) behavior

If a read instruction is executed, a 0 is read.

Executing a write instruction results in no change.

No error occurs.

MEM

0.15H

1.15H

2.15H

;

Bank

Row address

Column address

BANK1

MOV

M1,

MOV

M2,

MOV

M3,

#0000B

;

Assembler built-in macro instruction BANK

← 1

M1, M2, and M3 are defined symbolically in

# for different

banks, but are for BANK1 in this program. Thus, all of these

three instructions write 0s to data memory address 15H in BANK1.

Symbol definition pseudo instruction

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