ADE7166_15 Datasheet, PDF (90/152 Pages) Analog Devices – Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569
Mnemonic
JNC rel
JZ rel
JNZ rel
DJNZ Rn,rel
LJMP
LCALL addr16
JB bit,rel
JNB bit,rel
JBC bit,rel
CJNE A,dir,rel
CJNE A,#data,rel
CJNE Rn,#data,rel
CJNE @Ri,#data,rel
DJNZ dir,rel
MISCELLANEOUS
NOP
Description
Jump on carry equal to 0
Jump on accumulator = 0
Jump on accumulator ≠ 0
Decrement register, JNZ relative
Long jump unconditional
Long jump to subroutine
Jump on direct bit = 1
Jump on direct bit = 0
Jump on direct bit = 1 and clear
Compare A, direct JNE relative
Compare A, immediate JNE relative
Compare register, immediate JNE relative
Compare indirect, immediate JNE relative
Decrement direct byte, JNZ relative
No operation
Bytes
2
2
2
2
3
3
3
3
3
3
3
3
3
3
1
Cycles
3
3
3
3
4
4
4
4
4
4
4
4
4
4
1
READ-MODIFY-WRITE INSTRUCTIONS
Some 8052 instructions read the latch and others read the pin.
The state of the pin is read for instructions that input a port bit.
Instructions that read the latch rather than the pins are the ones
that read a value, possibly change it, and rewrite it to the latch.
Because these instructions involve modifying the port, it is
assumed that the pins being modified are outputs, so the output
state of the pin is read from the latch. This prevents a possible
misinterpretation of the voltage level of a pin. For example, if a
port pin is used to drive the base of a transistor, a 1 is written to
the bit to turn on the transistor. If the CPU reads the same port
bit at the pin rather than the latch, it reads the base voltage of
the transistor and interprets it as Logic 0. Reading the latch
rather than the pin returns the correct value of 1.
The instructions that read the latch rather than the pins are
called read-modify-write instructions and are listed in Table 66.
When the destination operand is a port or a port bit, these
instructions read the latch rather than the pin.
INSTRUCTIONS THAT AFFECT FLAGS
Many instructions explicitly modify the carry bit, such as the
MOV C bit and CLR C instructions. Other instructions that
affect status flags are listed in this section.
ADD A, Source
This instruction adds the source to the accumulator. No status
flags are referenced by the instruction.
Table 67. ADD A (Source) Affected Status Flags
Flag Description
C
Set if there is a carry out of Bit 7. Cleared otherwise.
Used to indicate an overflow if the operands are
unsigned.
OV Set if there is a carry out of Bit 6 or a carry out of Bit 7,
but not if both are set. Used to indicate an overflow for
signed addition. This flag is set if two positive operands
yield a negative result or if two negative operands yield
a positive result.
AC Set if there is a carry out of Bit 3. Cleared otherwise.
Table 66. Read-Modify-Write Instructions
Instruction Example
Description
ANL
ANL P0,A
Logic AND
ORL
ORL P1,A
Logic OR
XRL
XRL P2,A
Logic EX-OR
JBC
JBC P1.1,LABEL Jump if bit = 1 and clear bit
CPL
CPL P2.0
Complement bit
INC
INC P2
Increment
DEC
DEC P2
Decrement
DJNZ
DJNZ P0,LABEL Decrement and jump if not zero
MOV PX.Y,C¹ MOV P0.0,C
Move carry to Bit Y of Port X
CLR PX.Y¹ CLR P0.0
Clear Bit Y of Port X
SETB PX.Y¹ SETB P0.0
Set Bit Y of Port X
1 _{These instructions read the port byte (all eight bits), modify the addressed}
bit, and write the new byte back to the latch.
ADDC A, Source
This instruction adds the source and the carry bit to the accu-
mulator. The carry status flag is referenced by the instruction.
Table 68. ADDC A (Source) Affected Flags
Flag Description
C
Set if there is a carry out of Bit 7. Cleared otherwise.
Used to indicate an overflow if the operands are
unsigned.
OV Set if there is a carry out of Bit 6 or a carry out of Bit 7, but
not if both are set. Used to indicate an overflow for
signed addition. This flag is set if two positive operands
yield a negative result or if two negative operands yield
a positive result.
AC Set if there is a carry out of Bit 3. Cleared otherwise.
Rev. B | Page 90 of 152