- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379503 > UPD7554AA (NEC Corp.) 4-BIT SINGLE-CHIP MICROCOMPUTER PDF資料下載
參數(shù)資料
| 型號： | UPD7554AA |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機 |
| 文件頁數(shù)： | 19/64頁 |
| 文件大小： | 991K |
| 代理商： | UPD7554AA |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當(dāng)前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁
19
μ
PD7554A, 7554A(A)
2.6
ACCUMULATOR (A): 4 BITS
The accumulator is a 4-bit register which plays a major role in many types of arithmetic operations. The
accumulator may be processed in 8-bit units when paired with the data memory addressed by the pair register HL.
Fig. 2-7 Accumulator Configuration
A3
A2
A1
A0
A
2.7
ARITHMETIC LOGIC UNIT (ALU): 4 BITS
The arithmetic logic unit is a 4-bit arithmetic circuit to perform arithmetic and bit processing such as binary
addition, logical operation, incrementation, decrementation, and comparison.
2.8
PROGRAM STATUS WORD (PSW): 4 BITS
The program status word consists of skip flags (SK1 and SK0) and a carry flag (C). Bit 1 of the PSW is fixed at 0.
Fig. 2-8 Program Status Word Configuration
SK1
SK0
0
C
PSW
3
2
1
0
(1) Skip flags (SK1 and SK0)
Skip flags store the following skip status:
Stacking by the LAI instruction
Stacking by the LHLI instruction
Skip condition establishment by any instruction other than stack instructions
The skip flags are set and reset automatically when respective instructions are executed.
(2) Carry flag (C)
The carry flag is set to 1 when a carry from bit 3 of the ALU occurs when the add instruction (ACSC) is executed.
The flag is reset to 0 when the carry does not occur. The SC and RC instructions respectively set and reset the carry
flag. The SKC instruction tests the contents of the flag.
The content of the PSW are automatically stored in the stack area when the call instruction is executed. It cannot
be restored by the return inhstruction.
When the RESET signal is input, SK1 and SK0 are both cleared to zero and C becomes undefined.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD7554ACS | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD7554AG | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| UPD75CG08E | 4 BIT SINGLE CHIP CMOS MICROCOMPUTERS |
| UPD7508 | 4 BIT SINGLE CHIP CMOS MICROCOMPUTERS |
| UPD7508C | 4 BIT SINGLE CHIP CMOS MICROCOMPUTERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD7554AG-597-E2 | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-597-E2-A | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-603-E2 | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-603-E2-A | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD7554AG-611-E2 | 制造商:Renesas Electronics Corporation 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。