參數(shù)資料
型號(hào)： UPD7554AGA
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)： 19/64頁(yè)
文件大?。?/td> 991K
代理商： UPD7554AGA
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.
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