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| 型號(hào)： | S3P72N8-QW |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 14 X 20 MM, QFP-80 |
| 文件頁(yè)數(shù)： | 138/215頁(yè) |
| 文件大小： | 1419K |
| 代理商： | S3P72N8-QW |
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ADDRESS SPACES
S3C72N8/P72N8/C72N5/P72N5
2-20
SKIP CONDITION FLAGS (SC2, SC1, SC0)
The skip condition flags SC2, SC1, and SC0 in the PSW indicate the current program skip conditions and are set
and reset automatically during program execution. Skip condition flags can only be addressed by 8-bit read
instructions. Direct manipulation of the SC2, SC1, and SC0 bits is not allowed.
CARRY FLAG (C)
The carry flag is used to save the result of an overflow or borrow when executing arithmetic instructions involving
a carry (ADC, SBC). The carry flag can also be used as a 1-bit accumulator for performing Boolean operations
involving bit-addressed data memory.
If an overflow or borrow condition occurs when executing arithmetic instructions with carry (ADC, SBC), the carry
flag is set to "1". Otherwise, its value is "0". When a RESET occurs, the current value of the carry flag is retained
during power-down mode, but when normal operating mode resumes, its value is undefined.
The carry flag can be directly manipulated by predefined set of 1-bit read/write instructions, independent of other
bits in the PSW. Only the ADC and SBC instructions, and the instructions listed in Table 2-7, affect the carry flag.
Table 2-7. Valid Carry Flag Manipulation Instructions
Operation Type
Instructions
Carry Flag Manipulation
Direct manipulation
SCF
Set carry flag to "1"
RCF
Clear carry flag to "0" (reset carry flag)
CCF
Invert carry flag value (complement carry flag)
BTST C
Test carry and skip if C = "1"
Bit transfer
LDB (operand) (1),C
Load carry flag value to the specified bit
LDB C,(operand) (1)
Load contents of the specified bit to carry flag
Boolean manipulation
BAND C,(operand) (1)
AND the specified bit with contents of carry flag and save
the result to the carry flag
BOR C,(operand) (1)
OR the specified bit with contents of carry flag and save
the result to the carry flag
BXOR C,(operand) (1)
XOR the specified bit with contents of carry flag and save
the result to the carry flag
Interrupt routine
INTn (2)
Save carry flag to stack with other PSW bits
Return from interrupt
IRET
Restore carry flag from stack with other PSW bits
NOTES:
1.
The operand has three bit addressing formats: mema.a, memb.@L, and @H + DA.b.
2.
“INTn” refers to the specific interrupt being executed and is not an instruction.
相關(guān)PDF資料 |
PDF描述 |
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| S3C72N5XX-QW | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP80 |
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| S3P7544-SM | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO24 |
| S3C7544XX-AM | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDIP24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| S3P72P9 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:SINGLE-CHIP MICROCONTROLLER HAS BEEN DESIGNED FOR HIGH PERFORMANCE USING |
| S3P72Q5 | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:4?BIT CMOS MICROCONTROLLER USERS MANUAL |
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