参数资料
型号: MC68EC060RC50
厂商: Freescale Semiconductor
文件页数: 28/128页
文件大小: 0K
描述: IC MPU 32BIT 50MHZ 206-PGA
标准包装: 10
系列: M680x0
处理器类型: M680x0 32-位
速度: 50MHz
电压: 3.3V
安装类型: 通孔
封装/外壳: 206-BEPGA
供应商设备封装: 206-PGA(47.25x47.25)
包装: 托盘
Floating-Point Unit
MOTOROLA
M68060 USER’S MANUAL
6-5
6.1.3.1 FLOATING-POINT CONDITION CODE BYTE. The FPCC byte (see Figure 6-4)
contains four condition code bits that are set at the end of all arithmetic instructions involving
the floating-point data registers. These bits are sign of mantissa (N), zero (Z), infinity (I), and
NAN. The FMOVE FPm,<ea>, FMOVEM FPm, and FMOVE FPCR instructions do not affect
the FPCC.
To aid programmers of floating-point subroutine libraries, the MC68060 implements the four
FPCC bits in hardware instead of only implementing the four IEEE conditions. An instruction
derives the IEEE conditions when needed. For example, the programmers of a complex
arithmetic multiply subroutine usually prefer to handle special data types, such as zeros,
infinities, or NANs, separately from normal data types. The floating-point condition codes
allow users to efficiently detect and handle these special values.
6.1.3.2 QUOTIENT BYTE. The quotient byte (see Figure 6-5) provides compatibility with
the MC68881/MC68882. This byte is set at the completion of the modulo (FMOD) or IEEE
remainder (FREM) instruction, and contains the seven least significant bits of the unsigned
quotient as well as the sign of the entire quotient.
The quotient bits can be used in argument reduction for transcendentals and other functions.
For example, seven bits are more than enough to determine the quadrant of a circle in which
an operand resides. The quotient field (bits 22–16) remains set until the user clears it.
6.1.3.3 EXCEPTION STATUS BYTE. The EXC byte (see Figure 6-6) contains a bit for each
floating-point exception that can occur during the most recent arithmetic instruction or move
operation. The start of most operations clears this byte; however, operations that cannot
generate floating-point exceptions (the FMOVEM and FMOVE control register instructions)
do not clear this byte. An exception handler can use this byte to determine which floating-
point exception(s) caused a trap.
Figure 6-4. Floating-Point Condition Code (FPSR)
Figure 6-5. Floating-Point Quotient Byte (FPSR)
N
Z
I
NAN
31
30
29
28
27
26
25
24
NOT-A-NUMBER OR UNORDERED
INFINITY
ZERO
NEGATIVE
0
23
22
21
20
19
18
17
16
SEVEN LEAST SIGNIFICANT
BITS OF QUOTIENT
S
QUOTIENT
SIGN OF QUOTIENT
相关PDF资料
PDF描述
IDT71V65803S133BGG8 IC SRAM 9MBIT 133MHZ 119BGA
MPC8270ZUUPEA IC MPU POWERQUICC II 480-TBGA
IDT71V65803S133BG8 IC SRAM 9MBIT 133MHZ 119BGA
MPC860PCZQ66D4 IC MPU PWRQUICC 66MHZ 357-PBGA
IDT71V65803S100BGG8 IC SRAM 9MBIT 100MHZ 119BGA
相关代理商/技术参数
参数描述
MC68EC060RC66 功能描述:微处理器 - MPU 32B W/ CACHE RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC68EC060RC75 功能描述:微处理器 - MPU 32B W/ CACHE RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC68EC060ZU50 功能描述:IC MPU 68K 50MHZ 304-TBGA RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:M680x0 标准包装:1 系列:MPC85xx 处理器类型:32-位 MPC85xx PowerQUICC III 特点:- 速度:1.2GHz 电压:1.1V 安装类型:表面贴装 封装/外壳:783-BBGA,FCBGA 供应商设备封装:783-FCPBGA(29x29) 包装:托盘
MC68EC060ZU66 功能描述:微处理器 - MPU 32B W/ CACHE RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC68EC060ZU75 功能描述:微处理器 - MPU 32B W/ CACHE RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324