MC68EC000EI12 Freescale Semiconductor, MC68EC000EI12 Datasheet - Page 31

• Manufacturer Part Number: MC68EC000EI12
• Description: IC MPU 32BIT 12MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor
• Series: 68K - M680X0r

Specifications of MC68EC000EI12

• Processor Type: M680x0 32-Bit
• Speed: 12MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Core Size: 32 Bit
• Cpu Speed: 12MHz
• Digital Ic Case Style: PLCC
• No. Of Pins: 68
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: 0°C To +70°C
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Clock Frequency: 12MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Introduction
SNAN can be used as an escape mechanism for a user-defined, non-IEEE data type. The
FPU never creates an SNAN resulting from an operation.
The IEEE specification defines NAN processing used as an input to an operation. A
nonsignaling NAN must be returned when using an SNAN as an input and there is a
disabled SNAN trap. The FPU does this by using the source SNAN, setting the MSB of the
mantissa, and storing the resulting nonsignaling NAN in the destination. Because of the
IEEE formats for NANs, the result of setting an SNAN MSB is always a nonsignaling NAN.
When the FPU creates a NAN, the NAN always contains the same bit pattern in the
mantissa. All bits of the mantissa are ones for any precision. When the user creates a NAN,
any nonzero bit pattern can be stored in the mantissa.
1.6.6 Data Format and Type Summary
Tables 1-4 through 1-6 summarize the data type specifications for single-, double-, and
extended-precision data formats. Packed decimal real formats support all data types except
denormalized numbers. Table 1-7 summarizes the data types for the packed decimal real
format.
1-20
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
MOTOROLA