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ETL9444 Datasheet(PDF) 19 Page - STMicroelectronics

Part # ETL9444
Description  4-BIT NMOS MICROCONTROLLERS
PDF  27 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ETL9444 Datasheet(HTML) 19 Page - STMicroelectronics

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TRANSFER OF CONTROL INSTRUCTIONS
Mnem Operand
Hex
Code
Machine
Language
Code
(binary)
Data Flow
Skip
Conditions
Description
JID
FF
| 1 1 1 1 | 1 1 1 1 |
_________________
ROM (PC 10:8 A, M)
→ PC7:0
None
Jump Indirect (note 3)
JMP
a
6–
| 011 0| 0 | a 10 :8 |
_________________
|
a 7:0
|
_________________
A
→ PC
None
Jump
JP
a
| 1 |
a 6:0
|
_________________
(pages 2, 3 only)
or
|1 1 |
a 5:0
|
_________________
(all other pages)
A
→ PC
6: 0
A
→ PC
5: 0
None
Jump within Page (note 4)
JSRP
a
| 1 0 |
a 5:0
|
_________________
PC + 1
→ SA → SB → SC
00010
→ PC 10:6
a
→ PC 5:0
None
Jump to Subroutine Page
(note 5)
JSR
a
6–
| 0 1 1 0 | 1 | a10 :8 |
_________________
|
a 7:0
|
_________________
PC + 1
→ SA → SB → SC
a
→ PC
None
Jump to Subroutine
RET
48
| 0 1 0 0 | 1 0 0 0 |
_________________
SC
→ SB → SA → PC None
Return from Subroutine
RETSK
49
| 0 1 0 0 | 1 0 0 1 |
_________________
SC
→ SB → SA → PC Always
Skip on
Return
Return from Subroutine
then Skip
Table 2 : ETL9444/L9445 Instruction Set.
ARITHMETIC INSTRUCTIONS
Mnem Operand
Hex
Code
Machine
Language
Code
(binary)
Data Fl ow
Skip
Conditions
Description
ASC
30
| 00 11| 0 000 |
_______________
A + C + RAM(B)
→ A
Carry
→ C
Carry
Add with Carry Skip on
Carry
ADD
31
| 0 0 11| 0 001 |
_______________
A + RAM(B)
→ A
None
Add RAM to A
ADT
4A
| 0 10 0| 101 0 |
_______________
A+1010 → A
None
Add Ten to A
AISC
y
5-
| 0 1 0 1 |
y
|
_______________
A+ y
→ A
Carry
Add Immediate Skip on
Carry (y
≠ 0)
CASC
10
| 00 01| 0 000 |
_______________
A + RAM(B) + C
→ A
Carry
→ C
Carry
Complement and Add with
Carry, Skip on Carry
CLRA
00
| 0 0 0 0 | 0 0 0 0 |
_______________
0
→ A
None
Clear A
COMP
40
| 0 1 0 0 | 0 0 0 0 |
_______________
A
→ A
None
Ones Complement of A to A
NOP
44
| 0 1 00| 0 100 |
_______________
None
None
No Operation
RC
32
| 0 0 11| 0 010 |
_______________
”0”
→ C
None
Reset C
SC
22
| 0 0 10| 0 010 |
_______________
”1”
→ C
None
Set C
XOR
02
| 0 0 00| 0 010 |
_______________
A
⊕ RAM(B) → A
None
Exclusive-OR Ram with A
ETL9444/9445–ETL9344/9345
19/27



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