MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 194

• Manufacturer Part Number: MC68EC000EI20
• Description: IC MPU 32BIT 20MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI20

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Integer Instructions
DBcc
Operation:
Assembler
Syntax:
Attributes:
Description: Controls a loop of instructions. The parameters are a condition code, a data
Condition Codes:
4-90
Not affected.
register (counter), and a displacement value. The instruction first tests the condition for
termination; if it is true, no operation is performed. If the termination condition is not
true, the low-order 16 bits of the counter data register decrement by one. If the result
is – 1, execution continues with the next instruction. If the result is not equal to – 1,
execution continues at the location indicated by the current value of the program
counter plus the sign-extended 16-bit displacement. The value in the program counter
is the address of the instruction word of the DBcc instruction plus two. The
displacement is a twos complement integer that represents the relative distance in
bytes from the current program counter to the destination program counter. Condition
code cc specifies one of the following conditional tests (refer to Table 3-19 for more
information on these conditional tests):
Mnemonic
CS(LO)
CC(HI)
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
Test Condition, Decrement, and Branch
EQ
GE
GT
LE
If Condition False
DBcc Dn, < label >
Size = (Word)
HI
F
Then (Dn – 1
Greater or Equal
Less or Equal
Greater Than
Carry Clear
Condition
Carry Set
Equal
False
High
(M68000 Family)
Dn; If Dn
Mnemonic
– 1 Then PC + d
NE
VC
VS
LS
LT
PL
MI
T
Condition
Overflow Clear
Low or Same
Overflow Set
Less Than
Not Equal
Minus
True
Plus
n
PC)
DBcc
MOTOROLA