MC68340 datasheet(163/441 Pages) FREESCALE

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5- 26

MC68340 USER’S MANUAL

MOTOROLA

5.3.3.7 BINARY-CODED DECIMAL (BCD) INSTRUCTIONS. Five instructions support

operations on BCD numbers. The arithmetic operations on packed BCD numbers are add

decimal with extend (ABCD), subtract decimal with extend (SBCD), and negate decimal

with extend (NBCD). Table 5-9 is a summary of the BCD operations.

Table 5-9. Binary-Coded Decimal Operations

Instruction

Operand

Syntax

Operand Size

Operation

ABCD

Dn, Dn

– (An), – (An)

Source 10 + Destination10 + X ⇒ Destination

NBCD

〈ea〉

0 – Destination10 – X ⇒ Destination

SBCD

Dn, Dn

– (An), – (An)

Destination10 – Source10 – X ⇒ Destination

5.3.3.8 PROGRAM CONTROL INSTRUCTIONS. A set of subroutine call and return

instructions and conditional and unconditional branch instructions perform program control

operations. Table 5-10 summarizes these instructions.

Table 5-10. Program Control Operations

Instruction

Operand

Syntax

Operand Size

Operation

Conditional

Bcc

〈label〉

8, 16, 32

If condition true, then PC + d

⇒ PC

DBcc

, 〈label〉

If condition false, then Dn – 1

⇒ PC;

if Dn

≠ (– 1), then PC + d ⇒ PC

Scc

〈ea〉

If condition true, then destination bits are set to 1;

else destination bits are cleared to 0

Unconditional

BRA

〈label〉

8, 16, 32

PC + d

⇒ PC

BSR

〈label〉

8, 16, 32

SP – 4

⇒ SP; PC ⇒ (SP); PC + d ⇒ PC

JMP

〈ea〉

none

Destination

⇒ PC

JSR

〈ea〉

none

SP – 4

⇒ SP; PC ⇒ (SP); destination ⇒ PC

NOP

none

PC + 2

⇒ PC

Returns

RTD

〈d〉

(SP)

⇒ PC; SP + 4 + d ⇒ SP

RTR

none

(SP)

⇒ CCR; SP + 2 ⇒ SP; (SP) ⇒ PC; SP + 4 ⇒

RTS

none

(SP)

⇒ PC; SP + 4 ⇒ SP

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