參數(shù)資料
型號: PIC17LC766-08/PT
廠商: Microchip Technology
文件頁數(shù): 8/159頁
文件大小: 0K
描述: IC MCU OTP 16KX16 A/D PWM 80TQFP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
標(biāo)準(zhǔn)包裝: 119
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(shè)備: 欠壓檢測/復(fù)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(zhuǎn)換器: A/D 16x10b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 80-TQFP
包裝: 托盤
Section 3 Floating-Point Unit (FPU)
R01UH0025EJ0300 Rev. 3.00
Page 73 of 1336
Sep 24, 2010
SH7261 Group
Bit
Bit Name
Initial
Value
R/W
Description
17 to 12
Cause
All 0
R/W
11 to 7
Enable
All 0
R/W
6 to 2
Flag
All 0
R/W
FPU Exception Cause Field
FPU Exception Enable Field
FPU Exception Flag Field
Each time floating-point operation instruction is
executed, the FPU exception cause field is cleared to 0
first. When an FPU exception on floating-point
operation occurs, the bits corresponding to the FPU
exception cause field and FPU exception flag field are
set to 1. The FPU exception flag field remains set to 1
until it is cleared to 0 by software.
As the bits corresponding to FPU exception enable
filed are sets to 1, FPU exception processing occurs.
For bit allocations of each field, see table 3.3.
1
0
RM1
RM0
0
1
R/W
Rounding Mode
These bits select the rounding mode.
00: Round to Nearest
01: Round to Zero
10: Reserved
11: Reserved
Table 3.3
Bit Allocation for FPU Exception Handling
Field Name
FPU
Error (E)
Invalid
Operation (V)
Division
by Zero (Z)
Overflow
(O)
Underflow
(U)
Inexact
(I)
Cause
FPU exception
cause field
Bit 17
Bit 16
Bit 15
Bit 14
Bit 13
Bit 12
Enable
FPU exception
enable field
None
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Flag
FPU exception flag
field
None
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Note:
No FPU error occurs in the SH2A-FPU.
3.3.3
Floating-Point Communication Register (FPUL)
Information is transferred between the FPU and CPU via FPUL. FPUL is a 32-bit system register
that is accessed from the CPU side by means of LDS and STS instructions. For example, to
convert the integer stored in general register R1 to a single-precision floating-point number, the
processing flow is as follows:
R1
→ (LDS instruction) → FPUL → (single-precision FLOAT instruction) → FR1
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