MC68030FE20C Freescale Semiconductor, MC68030FE20C Datasheet - Page 70

• Manufacturer Part Number: MC68030FE20C
• Description: IC MPU 32BIT ENHANCED 132-CQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68030FE20C

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-CQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

MOTOROLA
2.6.1 Addressing Capabilities
this capability, its performance has been optimized for addressing with ad-
the base address register in calculating the effective address. This allows any
the least significant word can be sign-extended to provide a 32-bit index
value (refer to Figure 2-5).
Several of the addressing techniques described in this section use data reg-
isters and address registers interchangeably. While the MC68030 provides
dress registers. The performance of a program that uses address registers
in address calculations is superior to that of a program that similarly uses
data registers. The specification of addresses with data registers should be
used sparingly (if at all), particularly in programs that require maximum
performance.
(BS) bit in the full format extension word (see Figure 2-4) suppresses use of
extension to the M68000 Family because the MC68030 and MC68020 can use
capability of specifying the size and scale of an index register (Xn.SIZE*SCALE)
In both the MC68020 and the MC68030, setting the base register suppress
index register to be used in place of the base register. Since any of the data
registers can be index registers, this provides a data register indirect form
(Dn). The mode could be called register indirect (Rn) since either a data
register or an address register can be used. This addressing mode is an
both the data registers and the address registers to address memory. The
in these modes provides additional addressing flexibility. Using the SIZE
parameter, either the entire contents of the index register can be used, or
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V / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / I
31
31
Figure 2-5. Using SIZE in the Index Selection
MC68030 USER'S MANUAL
: USED IN AOORESS CALCULATION
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0
0
2-25
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