MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 548

• 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: -

CPU32 Instructions
TBLS
TBLSN
7-8
If R = 1 (TABLENR), the result is returned in register Dx without rounding. If the size is
byte, the integer portion of the result is returned in Dx 15 – 8; the integer portion of a
word result is stored in Dx 23 – 8; the least significant 24 bits of a long result are stored
in Dx 31 – 8. Byte and word results are sign-extended to fill the entire 32-bit register.
For all sizes, the 8-bit fractional portion of the result is returned to the low byte of the
data register, Dx 7 – 0. User software can make use of the fractional data to reduce
cumulative errors in lengthy calculations or implement rounding algorithms different
from that provided by other forms of TBLS. The previously described assumed radix
point places two restrictions on the programmer:
1. Tables are limited to 257 entries in length.
2. Interpolation resolution is limited to 1/256, the distance between consecutive ta-
ble entries. The assumed radix point should not, however, be construed by the
programmer as a requirement that the independent variable be calculated as a
fractional number in the range 0 < < 255. On the contrary, X should be consid-
ered an integer in the range 0 <
compressed representation of a linearized function in which only every 256th
value is actually stored in memory.
WORD
LONG
BYTE
The long-word result contains only the least significant 24 bits of
integer precision.
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
SIGN-EXTENDED
SIGN-EXTENDED
31
Table Lookup and Interpolate (Signed)
RESULT
24
SIGN-EXTENDED
23
RESULT
RESULT
(CPU32)
NOTE
< 65535, realizing that the table is actually a
16
15
RESULT
RESULT
RESULT
8
7
FRACTION
FRACTION
FRACTION
TBLSN
TBLS
MOTOROLA
0