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UPD17062 датащи(PDF) 39 Page - NEC

номер детали UPD17062
подробное описание детали  4-BIT SINGLE-CHIP MICROCONTROLLER CONTAINING PLL FREQUENCY SYNTHESIZER AND IMAGE DISPLAY CONTROLLER
PDF  296 Pages
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производитель  NEC [NEC]
домашняя страница  http://www.nec.com/
Logo NEC - NEC

UPD17062 датащи(HTML) 39 Page - NEC

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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.
M1
M2
M3
MEM
MEM
MEM
0.15H
1.15H
2.15H
;
;
;
Bank
Row address
Column address
BANK1
MOV
M1,
MOV
M2,
MOV
M3,
#0000B
#0000B
#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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