參數(shù)資料
型號： TS87C51RC2-VCA
廠商： Atmel
文件頁數(shù)： 26/84頁
文件大?。?/td> 0K
描述： IC MCU 8BIT 32K OTP 40MHZ 40-DIP
標(biāo)準(zhǔn)包裝： 9
系列： 87C
核心處理器： 8051
芯體尺寸： 8-位
速度： 40/30MHz
連通性： UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 32KB（32K x 8）
程序存儲器類型： OTP
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
DS70292G-page 34
2007-2012 Microchip Technology Inc.
3.8.3.2
Data Space Write Saturation
In addition to adder/subtracter saturation, writes to data
space can also be saturated, but without affecting the
contents of the source accumulator. The data space
write saturation logic block accepts a 16-bit, 1.15
fractional value from the round logic block as its input,
together with overflow status from the original source
(accumulator) and the 16-bit round adder. These inputs
are combined and used to select the appropriate 1.15
fractional value as output to write to data space
memory.
If the SATDW bit in the CORCON register is set, data
(after rounding or truncation) is tested for overflow and
adjusted accordingly:
For input data greater than 0x007FFF, data
written to memory is forced to the maximum
positive 1.15 value, 0x7FFF.
For input data less than 0xFF8000, data written to
memory is forced to the maximum negative 1.15
value, 0x8000.
The Most Significant bit of the source (bit 39) is used to
determine the sign of the operand being tested.
If the SATDW bit in the CORCON register is not set, the
input data is always passed through unmodified under
all conditions.
3.8.4
BARREL SHIFTER
The barrel shifter can perform up to 16-bit arithmetic or
logic right shifts, or up to 16-bit left shifts in a single
cycle. The source can be either of the two DSP
accumulators or the X bus (to support multi-bit shifts of
register or memory data).
The shifter requires a signed binary value to determine
both the magnitude (number of bits) and direction of the
shift operation. A positive value shifts the operand right.
A negative value shifts the operand left. A value of ‘0’
does not modify the operand.
The barrel shifter is 40 bits wide, thereby obtaining a
40-bit result for DSP shift operations and a 16-bit result
for MCU shift operations. Data from the X bus is
presented to the barrel shifter between bit positions 16
and 31 for right shifts, and between bit positions 0 and
16 for left shifts.
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