MC68EC040RC25 Freescale Semiconductor, MC68EC040RC25 Datasheet - Page 287
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MC68EC040RC25
Manufacturer Part Number
MC68EC040RC25
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040RC25.pdf
(442 pages)
Specifications of MC68EC040RC25
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
179
Package Type
PGA
Lead Free Status / Rohs Status
Supplier Unconfirmed
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FPTS, FPTE, FPTM—Collectively, these fields are referred to as the FPTEMP register
and normally contain the destination operand for dyadic operations converted to extended
precision. If the instruction specifies a packed decimal real source, bits 95–64 of the
operand reside in FPTM [31–00], and the FPTS, FPTE, and FPTM [63–32] fields are
undefined.
OPCLASS—This field refers to bits 15–13 of CMDREG1B. Note that CMDREG1B is
identical to the second word of a floating-point arithmetic instruction opcode.
STAG, DTAG—These 3-bit fields specify the data type of the source and destination
operands, respectively. STAG is undefined for a packed decimal real source operand. The
encodings for STAG and DTAG are as follows:
T—If set, this bit indicates that a post-instruction exception has occurred. Since only an
opclass 3 instruction can indicate a post-instruction exception, this bit indicates that the
exception is caused by an FMOVE OUT instruction.
WBTS, WBTE [15,14–00], WBTM [66,65–02,01,00], SBIT—These fields contain the
exception operand in internal data format for E3 exceptions. Collectively, these fields are
called the WBTEMP and are an image of the intermediate result. WBTM66 is the overflow
bit; WBTM1, WBTM0, and SBIT are the guard, round, and sticky bits, respectively.
MOTOROLA
000 = Normalized
001 = Zero
010 = Infinity
011 = NAN
100 = Extended-Precision Denormalized or Unnormalized Input
101 = Single- or Double-Precision Denormalized Input
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
M68040 USER’S MANUAL
9- 43
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