參數(shù)資料
型號(hào)： MC68HC11N4
廠商： Motorola, Inc.
元件分類： 8位微控制器
英文描述： 8-Bit microcontroller(8位微控制器)
中文描述： 8位微控制器（8位微控制器）
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 261K
代理商： MC68HC11N4
AN1215/D
MOTOROLA
5
The 8-bit ALU control register (ALUC) controls ALU operation.
Table 1
summarizes ALUC bit functions.
SIG — Signed Number Enable
0 = AREG, BREG, and CREG contents are unsigned numbers
1 = AREG, BREG, and CREG contents are signed numbers
DIV — Division Enable
MAC — Multiply with Accumulated Product Enable
DCC — Division Compensation for Concatenated Quotient Enable
TRG — Function Start Trigger Bit
Always reads zero
0 = No effect
1 = Start ALU
Bits [2:0] — Not implemented
Always read zero
The 8-bit ALU status register (ALUF) signals when an operation is complete and indicates the status of the
completed operation.
NEG — Negative Result
NEG is set if the result is a negative value. This is a read-only-bit. Writes to this bit do not affect the
value.
RZF — Remainder Equals Zero Flag
RZF is set if the remainder is zero.
Bits [5:3] — Not implemented
Always read zero
ALUC — Arithmetic Logic Unit Control
$0044
Bit 7
SIG
0
6
5
4
3
2
—
0
1
—
0
Bit 0
—
0
DIV
0
MAC
0
DCC
0
TRG
0
RESET:
Table 1 ALUC Bit Function
SIG
0
1
0
1
0
1
1
0
1
1
DIV
0
0
0
0
1
1
1
1
1
1
MAC
0
0
1
1
0
0
0
1
1
1
DCC
X
X
X
X
X
0
1
X
0
1
FUNCTION
Unsigned MUL
Signed MUL
Unsigned MAC
Signed MAC
Unsigned IDIV
Signed IDIV
Signed IDIV DCC
Unsigned FDIV
Signed FDIV
Signed FDIV DCC
START TRIGGERS
Write BREG or set TRG
Write BREG or set TRG
Write BREG or set TRG
Write BREG or set TRG
Write AREG or set TRG
Write AREG or set TRG
Write AREG or set TRG
Set TRG
Set TRG
Set TRG
ALUF — Arithmetic Logic Unit Status Flag Register
$0049
Bit 7
NEG
0
6
5
—
0
4
—
0
3
—
0
2
1
Bit 0
ACF
0
RZF
0
OVF
0
DZF
0
RESET:
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