Intel mcs-48 manual ===~

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	o 1	14 15_Display
lst entry	r;TT_- _- _- _-ITI		RAM
	L..:.LJ.		Address
	o 1	14 15
2nd entry [20 =- - =IIJ
	o 1	14 15
16th entry	G21 ====:EEl
	o 1	14 15
17th entry	E0=	===~
	o 1	14 15
18th entry	@EI= ===:EE1

LEFT ENTRY MODE (AUTO INCREMENT)

Right Entry

Right entry is the method used by most e!ectronic ca)culators. The first entry is placed in the right most display character. The next entry is also placed in the right most character after the display is shifted left one character. The left most character is shifted off the end and is lost.

1 2 14 15 O-Display

lstentry OJ- - - =I I l'I::~ess

2 3 15 0 1

2nd entry OJ ====I 11 I 2

	01234587				Display
lst entry		I		I I I I	RAM
	11		1·1		I Address
	o 1		234 567		I
2nd entry 11		12	I	I I I I

o 1 234 567

Command l'12 I I II I 1 1 10010101

Enter next at Location 5 Auto Increment o 1 234 567

3rd entry 11 I2 I I I 1 3 I I I

o 1 234 567

4thentry 111211113141

LEFT ENTRY MODE (AUTO INCREMENT)

!n the Right Entry mode, Auto Incrementing and non Incrementing have the same effect as in the Left Entry except if the address sequence is interrupted:

23 4 5 6 7 O___ Display

1st entry 1 I I I I I I l'I :~~ess

	23456701
2nd entry	I! I I \1 I21
	23456701
Command	11 121
10010101

	3	4	0	1	2
3rd entry	ITI===J 1 I 21				3
	1	2	14	15	0
17th entry	r2:E[		===1151161171
	.2	3	15	0	1
18th entry	~=		===1161171181

RIGHT ENTRY MODE (AUTO INCREMENT)

Note that now the display position and register address do not correspond. Consequently, entering a character to an arbitrary position in the Auto Increment mode may have unexpected results. Entry starting at Display RAM address o with sequential entry is recommended.

Auto Increment

In the Left Entry mode, Auto Incrementing causes the address where the CPU will next write to be incremented by one and the character appears in the next location. With non-Auto Incrementing the entry is both to the same RAM address and display position. Entry to an arbitrary address in the Auto Increment mode has no undesirable side effects and the result is predictable:

Enter next at Location 5 Auto Increment

		3	4	5	6	7	0	1	2
Jrd	entry	I		1 3 1			11 121		1
	1
		4	5	6	7	0	1	2	3
4th	entry	1	3	1 4 1		11	121	I	I

RIGHT ENTRY MODE (AUTO INCREMENT)

Starting at an arbitrary location operates as shown below:

o 1 2 3 4 5 6 7__ Display Command10010101 111I111I1:~~ess

Enter next at Location 5 Auto Increment

1 234 5 6 7 0

1st entry I I I I I 11

23456701

2nd entry I \ I I

8th entry 14151617181112131

9th entry 15161718191213 141

RIGHT ENTRY MODE (AUTO INCREMENT)

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