Echelon Neuron - Manual (Page 74)

ADC (Add with Carry)
The ADC instruction adds two numbers with the value of the Carry flag. The
ADC instruction uses the implicit addressing mode. The ADC instruction
retrieves both TOS and NEXT from the data stack and adds them together with
the value of the Carry flag. TOS and NEXT are consumed, and the result is
placed in TOS. The operation modifies the Carry flag as result of the unsigned
addition.
The ADC instruction applies to Series 3100, 5000, and 6000 devices.
Syntax:
The ADC instruction requires no operands:
ADC
Table 10 describes the attributes of the ADC instruction.
Table 10. ADC Instruction
Instruction Hexadecimal
Opcode
Instruction
Size (Bytes)
CPU Cycles
Required
Affect on
Carry Flag
ADC 54 1 4 Used, modified
Example:
The following example performs the operation 2+3. The example assumes that
the Carry flag is set.
pushs #2 ; (2, -, -)
pushs #3 ; (3, 2, -)
adc ; (6, -, -)
The value of TOS after this code executes is 6 because 2+3+Carry = 6. In this
case, the value of the Carry flag is used for the addition, and then modified
(cleared) because the unsigned addition did not require an extra carry bit.
64 Neuron Assembly Language Instruction Statements