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| 型號： | PIC17C75X |
| 英文描述： | Micropower Precision Series Reference Family; Package: SOT; No of Pins: 3; Temperature Range: 0°C to +70°C |
| 文件頁數(shù)： | 30/71頁 |
| 文件大?。?/td> | 1173K |
| 代理商： | PIC17C75X |
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PIC17C4X
DS30412C-page 36
1996 Microchip Technology Inc.
6.2.2.1
ALU STATUS REGISTER (ALUSTA)
The ALUSTA register contains the status bits of the
Arithmetic and Logic Unit and the mode control bits for
the indirect addressing register.
As with all the other registers, the ALUSTA register can
be the destination for any instruction. If the ALUSTA
register is the destination for an instruction that affects
the Z, DC or C bits, then the write to these three bits is
disabled. These bits are set or cleared according to the
device logic. Therefore, the result of an instruction with
the ALUSTA register as destination may be different
than intended.
For example, CLRF ALUSTA will clear the upper four bits
and set the Z bit. This leaves the ALUSTA register as
0000u1uu
(where u = unchanged).
It is recommended, therefore, that only BCF, BSF, SWAPF
and MOVWF instructions be used to alter the ALUSTA
register because these instructions do not affect any
status bit. To see how other instructions affect the sta-
tus bits, see the “Instruction Set Summary.”
Arithmetic and Logic Unit (ALU) is capable of carrying
out arithmetic or logical operations on two operands or
a single operand. All single operand instructions oper-
ate either on the WREG register or a le register. For
two operand instructions, one of the operands is the
WREG register and the other one is either a le register
or an 8-bit immediate constant.
Note 1: The C and DC bits operate as a borrow
out bit in subtraction. See the SUBLW and
SUBWF
instructions for examples.
Note 2: The overow bit will be set if the 2’s com-
plement result exceeds +127 or is less
than -128.
FIGURE 6-7:
ALUSTA REGISTER (ADDRESS: 04h, UNBANKED)
R/W - 1
R/W - x
FS3
FS2
FS1
FS0
OV
Z
DC
C
R = Readable bit
W = Writable bit
-n = Value at POR reset
(x = unknown)
bit7
bit0
bit 7-6:
FS3:FS2: FSR1 Mode Select bits
00 = Post auto-decrement FSR1 value
01 = Post auto-increment FSR1 value
1x = FSR1 value does not change
bit 5-4:
FS1:FS0: FSR0 Mode Select bits
00 = Post auto-decrement FSR0 value
01 = Post auto-increment FSR0 value
1x = FSR0 value does not change
bit 3:
OV: Overow bit
This bit is used for signed arithmetic (2’s complement). It indicates an overow of the 7-bit magnitude,
which causes the sign bit (bit7) to change state.
1 = Overow occurred for signed arithmetic, (in this arithmetic operation)
0 = No overow occurred
bit 2:
Z: Zero bit
1 = The result of an arithmetic or logic operation is zero
0 = The results of an arithmetic or logic operation is not zero
bit 1:
DC: Digit carry/borrow bit
For ADDWF and ADDLW instructions.
1 = A carry-out from the 4th low order bit of the result occurred
0 = No carry-out from the 4th low order bit of the result
Note: For borrow the polarity is reversed.
bit 0:
C: carry/borrow bit
For ADDWF and ADDLW instructions.
1 = A carry-out from the most signicant bit of the result occurred
Note that a subtraction is executed by adding the two’s complement of the second operand. For rotate
(RRCF, RLCF) instructions, this bit is loaded with either the high or low order bit of the source register.
0 = No carry-out from the most signicant bit of the result
Note: For borrow the polarity is reversed.
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| PIC17C762-16/PT | 功能描述:8位微控制器 -MCU 16KB 678 RAM 66 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC17C762-16E/L | 功能描述:8位微控制器 -MCU 16KB 678 RAM 66 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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