C2510Fx / CC2511Fx
second register bank. Thus, in order to use
more than one register bank, the SPshould be
initialized to a different location not used for
data storage.
SP (0x81) – Stack Pointer
Bit
Name
Reset
R/W
Description
Stack Pointer
7:0
SP[7:0]
0x07
R/W
11.4 Instruction Set Summary
The 8051 instruction set is summarized in
Table 37. All mnemonics copyrighted © Intel
Corporation 1980.
can be anywhere within the 8/16/32 KB
CODE memory space.
• addr11 – 11-bit destination address.
Used by ACALL and AJMP. The branch
will be within the same 2 KB page of
program memory as the first byte of the
following instruction.
• rel – Signed (two’s complement) 8-bit
offset byte. Used by SJMP and all
conditional jumps. Range is –128 to
+127 bytes relative to first byte of the
following instruction.
The following conventions are used in the
instruction set summary:
• Rn – Register R7-R0 of the currently
selected register bank.
• direct – 8-bit internal data location’s
address. This can be DATA area (0x00
– 0x7F) or SFR area (0x80 – 0xFF).
• @Ri – 8-bit internal data location, DATA
area (0x00 – 0xFF) addressed indirectly
through register R1or R0.
• bit – direct addressed bit in DATA area
or SFR.
• #data – 8-bit constant included in
instruction.
• #data16 – 16-bit constant included in
instruction.
• addr16 – 16-bit destination address.
Used by LCALL and LJMP. A branch
The instructions that affect CPU flag settings
located in PSW are listed in Table 38 on Page
58. Note that operations on the PSWregister or
bits in PSWwill also affect the flag settings.
Mnemonic
Description
Hex
Bytes
Cycles
Opcode
Arithmetic Operations
ADD A,Rn
Add register to accumulator
28-2F
25
1
2
1
2
1
2
1
2
1
2
1
2
1
1
2
1
2
2
2
1
2
2
2
1
2
2
2
1
2
3
ADD A,direct
ADD A,@Ri
ADD A,#data
ADDC A,Rn
ADDC A,direct
ADDC A,@Ri
ADDC A,#data
SUBB A,Rn
SUBB A,direct
SUBB A,@Ri
SUBB A,#data
INC A
Add direct byte to accumulator
Add indirect RAM to accumulator
Add immediate data to accumulator
Add register to accumulator with carry flag
Add direct byte to A with carry flag
Add indirect RAM to A with carry flag
Add immediate data to A with carry flag
Subtract register from A with borrow
Subtract direct byte from A with borrow
Subtract indirect RAM from A with borrow
Subtract immediate data from A with borrow
Increment accumulator
26-27
24
38-3F
35
36-37
34
98-9F
95
96-97
94
04
INC Rn
Increment register
08-0F
05
INC direct
Increment direct byte
SWRS055D
Page 54 of 243
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