參數(shù)資料
型號: PIC17LC766T-08/L
廠商: Microchip Technology
文件頁數(shù): 9/159頁
文件大?。?/td> 0K
描述: IC MCU OTP 16KX16 A/D PWM 84PLCC
標準包裝: 300
系列: PIC® 17C
核心處理器: PIC
芯體尺寸: 8-位
速度: 8MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 66
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: OTP
RAM 容量: 902 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 16x10b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 84-LCC(J 形引線)
包裝: 帶卷 (TR)
Section 3 Floating-Point Unit (FPU)
Page 74 of 1336
R01UH0025EJ0300 Rev. 3.00
Sep 24, 2010
SH7261 Group
3.4
Rounding
In a floating-point instruction, rounding is performed when generating the final operation result
from the intermediate result. Therefore, the result of combination instructions such as FMAC will
differ from the result when using a basic instruction such as FADD, FSUB, or FMUL. Rounding is
performed once in FMAC, but twice in FADD, FSUB, and FMUL.
Which of the two rounding methods is to be used is determined by the RM bits in FPSCR.
FPSCR.RM[1:0] = 00: Round to Nearest
FPSCR.RM[1:0] = 01: Round to Zero
(1)
Round to Nearest
The operation result is rounded to the nearest expressible value. If there are two nearest
expressible values, the one with an LSB of 0 is selected.
If the unrounded value is 2
Emax (2 – 2–P) or more, the result will be infinity with the same sign as the
unrounded value. The values of Emax and P, respectively, are 127 and 24 for single-precision, and
1023 and 53 for double-precision.
(2)
Round to Zero
The digits below the round bit of the unrounded value are discarded.
If the unrounded value is larger than the maximum expressible absolute value, the value will
become the maximum expressible absolute value.
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