參數(shù)資料
型號: Q67120-C508
英文描述: IC-SM-8-BIT CPU 12-MHZ
中文描述: 集成電路釤8位CPU的12兆赫
文件頁數(shù): 46/121頁
文件大小: 1000K
代理商: Q67120-C508
Semiconductor Group
6-12
On-Chip Peripheral Components
C501
The reason why read-modify-write instructions are directed to the latch rather than the pin is to avoid
a possible misinterpretation of the voltage level at the pin. For example, a port bit might be used to
drive the base of a transistor. When a “1” is written to the bit, the transistor is turned on. If the CPU
then reads the same port bit at the pin rather than the latch, it will read the base voltage of the
transistor (approx. 0.7 V, i.e. a logic low level!) and interpret it as “0”. For example, when modifying
a port bit by a SETB or CLR instruction, another bit in this port with the above mentioned
configuration might be changed if the value read from the pin were written back to the latch.
However, reading the latch rater than the pin will return the correct value of “1”.
Table 6-5
Read-Modify-Write"- Instructions
Instruction
Function
ANL
Logic AND; e.g. ANL P1, A
ORL
Logic OR; e.g. ORL P2, A
XRL
Logic exclusive OR; e.g. XRL P3, A
JBC
Jump if bit is set and clear bit; e.g. JBC P1.1, LABEL
CPL
Complement bit; e.g. CPL P3.0
INC
Increment byte; e.g. INC P1
DEC
Decrement byte; e.g. DEC P1
DJNZ
Decrement and jump if not zero; e.g. DJNZ P3, LABEL
MOV Px.y,C
Move carry bit to bit y of port x
CLR Px.y
Clear bit y of port x
SETB Px.y
Set bit y of port x
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