SAB80C517-M16 SIEMENS [Siemens Semiconductor Group], SAB80C517-M16 Datasheet - Page 207

• Manufacturer Part Number: SAB80C517-M16
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

JMP
Function:
Description:
Example:
Operation:
Encoding:
Bytes:
Cycles:
Semiconductor Group
@A + DPTR
Jump indirect
Add the eight-bit unsigned contents of the accumulator with the sixteen-bit data
pointer, and load the resulting sum to the program counter. This will be the address
for subsequent instruction fetches. Sixteen-bit addition is performed (modulo 2
carry-out from the low-order eight bits propagates through the higher-order bits.
Neither the accumulator nor the data pointer is altered. No flags are affected.
An even number from 0 to 6 is in the accumulator. The following sequence of
instructions will branch to one of four AJMP instructions in a jump table starting at
JMP_TBL:
JMP_TBL: AJMP
If the accumulator equals 04 H when starting this sequence, execution will jump to
label LABEL2. Remember that AJMP is a two-byte instruction, so the jump
instructions start at every other address.
JMP
(PC)
1
2
0 1 1 1
(A) + (DPTR)
0 0 1 1
MOV
JMP
AJMP
AJMP
AJMP
DPTR, #JMP_TBL
@A + DPTR
LABEL0
LABEL1
LABEL2
LABEL3
208
Instruction Set
16
): a