UPD17062 datasheet(39/296 Pages) NEC

Part #	UPD17062

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

PDF	296 Pages

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Manufacturer	NEC [NEC]

Direct Link	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

UPD17062 Datasheet(PDF) 39 Page - NEC

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