MC68EC000EI10 Freescale Semiconductor, MC68EC000EI10 Datasheet - Page 36

• Manufacturer Part Number: MC68EC000EI10
• Description: IC MPU 32BIT 10MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI10

• Processor Type: M680x0 32-Bit
• Speed: 10MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Introduction
1.7 ORGANIZATION OF DATA IN REGISTERS
The following paragraphs describe data organization within the data, address, and control
registers.
1.7.1 Organization of Integer Data Formats in Registers
Each integer data register is 32 bits wide. Byte and word operands occupy the lower 8- and
16-bit portions of integer data registers, respectively. Long- word operands occupy the entire
32 bits of integer data registers. A data register that is either a source or destination operand
only uses or changes the appropriate lower 8 or 16 bits (in byte or word operations,
respectively). The remaining high-order portion does not change and goes unused. The
address of the least significant bit (LSB) of a long-word integer is zero, and the MSB is 31.
For bit fields, the address of the MSB is zero, and the LSB is the width of the register minus
one (the offset). If the width of the register plus the offset is greater than 32, the bit field
wraps around within the register. Figure 1-18 illustrates the organization of various data
formats in the data registers.
An example of a quad word is the product of a 32-bit multiply or the quotient of a 32-bit divide
operation (signed and unsigned). Quad words may be organized in any two integer data
registers without restrictions on order or pairing. There are no explicit instructions for the
management of this data format, although the MOVEM instruction can be used to move a
quad word into or out of registers.
Binary-coded decimal (BCD) data represents decimal numbers in binary form. Although
there are many BCD codes, the BCD instructions of the M68000 family support two formats,
packed and unpacked. In these formats, the LSBs consist of a binary number having the
numeric value of the corresponding decimal number. In the unpacked BCD format, a byte
defines one decimal number that has four LSBs containing the binary value and four
undefined MSBs. Each byte of the packed BCD format contains two decimal numbers; the
least significant four bits contain the least significant decimal number and the most
significant four bits contain the most significant decimal number.
MOTOROLA
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
1-25