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CPU

User Manual

UM001604-0108 Instruction Description

170

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Syntax

CP dst, src

Instruction Format

Operation

dst–src

The source operand is compared to (subtracted from) the destination operand, and the

appropriate Flags are set accordingly. The contents of both operands are unaffected.

Address modes R or IR can be used to specify a 4-bit Working Register. In this format, the

source or destination Working Register operand is specified by adding

1110b (Eh) to the

high nibble of the operand. For example, if Working Register R12 (CH) is the destination

operand, then

ECh is used as the destination operand in the Op Code.

Example 1

Cycles

OPC

(Hex)

Address

Mode

dst src

OPC dst src

6A2rr

6A3rlr

OPC src dst

10 A4 R R

10 A5 R IR

OPC dst src

10 A6 R IM

10 A7 IR IM

Flag Description

C Cleared if there is a carry from the most significant bit of the result. Set otherwise

indicating a borrow.

Z Set if the result is zero; cleared otherwise.

S Set if result bit 7 is set (negative); cleared otherwise.

V Set if arithmetic overflow occurs; cleared otherwise.

D Unaffected.

H Unaffected.

Esrcor Edst

Note:

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 259 260

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