參數(shù)資料
型號(hào)： UPD7566AA
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 18/58頁(yè)
文件大?。?/td> 471K
代理商： UPD7566AA
μ
PD7566A, 7566A(A)
18
2.6 ACCUMULATOR (A)
...... 4 BITS
This is a 4-bit register which plays a central role, when an arithmetic operation is performed. The accumulator
can also be used in pairs with a data memory address, indicated by pair register HL, to process 8-bit data.
Fig. 2-7 Accumulator
A3
A2
A1
A0
A
2.7 ARITHMETIC LOGIC UNIT (ALU) .
..... 4 BITS
This is a 4-bit arithmetic operation circuit that carries out operations such as binary addition, logic operations,
increment, decrement and comparison, as well as bit manipulation.
2.8 PROGRAM STATUS WORD (PSW)
...... 4 BITS
The PSW consists of two skip flags (SK1 and SK0) and a carry flag (C). Bit 1 of this register is always 0.
Fig. 2-8 Program Status Word
3
2
1
0
SK1
SK0
0
C
PSW
(1) Skip flags (SK1 and SK0)
These flags retain the following skip conditions:
String effect by LAI instruction
String effect by LHLI instruction
Establishment of skip conditions by instructions other than string-effect instructions
The skip flags are automatically set or reset each time an instruction has been executed.
(2) Carry flag (C)
This flag is set to 1, when an addition instruction (ACSC) is executed, and a carry is consequently
generated from the bit 3 of the ALU. If a carry is not generated, the carry flag is cleared to 0. In addition,
the carry flag can also be set by SC instruction, and cleared by RC instruction. The content of the flag can
be tested by SKC instruction.
The PSW contents are automatically stored in the stack area when a call instruction is executed, and
are not restored even when a return instruction is implemented. When the RESET signal is input, the SK1
and SK0 flags are cleared to 0, and the C flag content becomes undefined.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD7566CS044 制造商:Panasonic Industrial Company 功能描述:IC
UPD75P0016CU 制造商:Renesas Electronics Corporation 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP
UPD75P0016CU-A 制造商:Renesas Electronics Corporation 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP 制造商:Renesas Electronics 功能描述:75XL 6MHz Cut Tape 制造商:Renesas 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 42-Pin SPDIP
UPD75P0016GB-3BS-MTX 制造商:Renesas Electronics 功能描述:MCU 4-Bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP
UPD75P0016GB-3BS-MTX-A 制造商:Renesas Electronics Corporation 功能描述:MCU 4-bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP 制造商:Renesas 功能描述:MCU 4-bit 75XL CISC 16KB EPROM 2.5V/3.3V/5V 44-Pin PQFP
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