MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 101

• Manufacturer Part Number: MC68EC000EI16
• Description: IC MPU 32BIT 16MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI16

• Processor Type: M680x0 32-Bit
• Speed: 16MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Instruction Set Summary
When using the IEEE nonaware tests, the user receives a BSUN exception whenever a
branch is attempted and the NAN condition code bit is set, unless the branch is an FBEQ or
an FBNE. If the BSUN exception is enabled in the FPCR, the exception causes another
exception. Therefore, the IEEE nonaware program is interrupted if an unexpected condition
occurs. Compilers and programmers who are knowledgeable of the IEEE 754 standard
should use the IEEE aware tests in programs that contain ordered and unordered
conditions. Since the ordered or unordered attribute is explicitly included in the conditional
test, the BSUN bit is not set in the FPSR EXC byte when the unordered condition occurs.
Table 3-23 summarizes the conditional mnemonics, definitions, equations, predicates, and
whether the BSUN bit is set in the FPSR EXC byte for the 32 floating-point conditional tests.
The equation column lists the combination of FPCC bits for each test in the form of an
equation. All condition codes with an overbar indicate cleared bits; all other bits are set.
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