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STC89LE53RC Datasheet(PDF) 54 Page - STCmicro Technology Co,.Ltd

Part # STC89LE53RC
Description  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
PDF  165 Pages
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Manufacturer  STC [STCmicro Technology Co,.Ltd]
Direct Link  http://www.stcmicro.com/
Logo STC - STCmicro Technology Co,.Ltd

STC89LE53RC Datasheet(HTML) 54 Page - STCmicro Technology Co,.Ltd

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Operation:
DJNZ
(PC) ← (PC) + 2
← (PC) + 2
(PC) + 2
(direct) ← (direct) – 1
← (direct) – 1
(direct) – 1
IF (direct) > 0 or (direct) < 0
THEN
(PC) ← (PC) + rel
← (PC) + rel
(PC) + rel
INC
<byte>
Function:
Increment
Description:
INC increments the indicated variable by 1. An original value of 0FFH will overflow to
00H.No flags are affected. Three addressing modes are allowed: register, direct, or register-
indirect.
Note: When this instruction is used to modify an output port, the value used as the original
port data will be read from the output data latch, not the input pins.
Example:
Register 0 contains 7EH (011111110B). Internal RAM locations 7EH and 7FH contain 0FFH
and 40H, respectively. The instruction sequence,
INC @R0
INC
R0
INC @R0
will leave register 0 set to 7FH and internal RAM locations 7EH and 7FH holding
(respectively) 00H and 41H.
INC
A
Bytes:
1
Cycles:
1
Encoding:
0 0 0 0
0 1 0 0
Operation:
INC
(A) ← (A)+1
← (A)+1
INC
Rn
Bytes:
1
Cycles:
1
Encoding:
0 0 0 0
1 r r r
Operation:
INC
(Rn) ← (Rn)+1
← (Rn)+1
INC
direct
Bytes:
2
Cycles:
1
Encoding:
0 0 0 0
0 1 0 1
direct address
Operation:
INC
(direct)←(direct)
←(direct)
(direct)
54



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