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參數(shù)資料
| 型號(hào)： | S3C70F4XX-AV |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDIP30 |
| 封裝： | 0.400 INCH, SDIP-30 |
| 文件頁(yè)數(shù)： | 109/179頁(yè) |
| 文件大?。?/td> | 1070K |
| 代理商： | S3C70F4XX-AV |
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ADDRESS SPACES
S3C70F2/C70F4/P70F4
2-22
SKIP CONDITION FLAGS (SC2, SC1, SC0)
The skip condition flags SC2, SC1, and SC0 indicate the current program skip conditions and are set and reset
automatically during program execution. These flags are mapped to RAM bit locations FB1H.0, FB1H.1, and
FB1H.2 of the PSW.
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 mapped to bit location FB1H.3 in the PSW. It 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
Data transfer
RRC A
Rotate right with 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.
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