Renesas RL78 Series User Manual page 811

RL78/G1D
28.1 BCD Correction Circuit Function
The result of addition/subtraction of the BCD (binary-coded decimal) code and BCD code can be obtained as BCD
code with this circuit.
The decimal correction operation result is obtained by performing addition/subtraction having the A register as the
operand and then adding/ subtracting the BCD correction result register (BCDADJ).
28.2 Registers Used by BCD Correction Circuit
The BCD correction circuit uses the following registers.
● BCD correction result register (BCDADJ)
(1) BCD correction result register (BCDADJ)
The BCDADJ register stores correction values for obtaining the add/subtract result as BCD code through add/subtract
instructions using the A register as the operand.
The value read from the BCDADJ register varies depending on the value of the A register when it is read and those of
the CY and AC flags.
The BCDADJ register is read by an 8-bit memory manipulation instruction.
Reset input sets this register to undefined.
Address: F00FEH After reset: undefined
Symbol 7
BCDADJ
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
CHAPTER 28 BCD CORRECTION CIRCUIT
Figure 28-1. Format of BCD Correction Result Register (BCDADJ)
R
6 5
CHAPTER 28 BCD CORRECTION CIRCUIT
4 3 2 1 0
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