參數(shù)資料
型號(hào): R5F562N8ADBG#U0
廠商: Renesas Electronics America
文件頁數(shù): 136/148頁
文件大?。?/td> 0K
描述: MCU 32BIT FLASH 512KROM 176LFBGA
產(chǎn)品培訓(xùn)模塊: RX Compare Match Timer
RX DMAC
標(biāo)準(zhǔn)包裝: 1
系列: RX600
核心處理器: RX
芯體尺寸: 32-位
速度: 100MHz
連通性: EBI/EMI,I²C,SCI,SPI,USB
外圍設(shè)備: DMA,LVD,POR,PWM,WDT
輸入/輸出數(shù): 126
程序存儲(chǔ)器容量: 512KB(512K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 96K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10/12b,D/A 2x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 176-LFBGA
包裝: 托盤
PIC18F6520/8520/6620/8620/6720/8720
DS39609B-page 86
2004 Microchip Technology Inc.
Example 8-3 shows the sequence to do a 16 x 16
unsigned multiply. Equation 8-1 shows the algorithm
that is used. The 32-bit result is stored in four registers,
RES3:RES0.
EQUATION 8-1:
16 x 16 UNSIGNED
MULTIPLICATION
ALGORITHM
EXAMPLE 8-3:
16 x 16 UNSIGNED
MULTIPLY ROUTINE
Example 8-4 shows the sequence to do a 16 x 16
signed multiply. Equation 8-2 shows the algorithm
used. The 32-bit result is stored in four registers,
RES3:RES0. To account for the sign bits of the argu-
ments, each argument pairs’ Most Significant bit (MSb)
is tested and the appropriate subtractions are done.
EQUATION 8-2:
16 x 16 SIGNED
MULTIPLICATION
ALGORITHM
EXAMPLE 8-4:
16 x 16 SIGNED
MULTIPLY ROUTINE
MOVF
ARG1L, W
MULWF
ARG2L
; ARG1L * ARG2L ->
; PRODH:PRODL
MOVFF
PRODH, RES1
;
MOVFF
PRODL, RES0
;
MOVF
ARG1H, W
MULWF
ARG2H
; ARG1H * ARG2H ->
; PRODH:PRODL
MOVFF
PRODH, RES3
;
MOVFF
PRODL, RES2
;
MOVF
ARG1L, W
MULWF
ARG2H
; ARG1L * ARG2H ->
; PRODH:PRODL
MOVF
PRODL,
W
;
ADDWF
RES1, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2, F
;
CLRF
WREG
;
ADDWFC
RES3, F
;
MOVF
ARG1H, W
;
MULWF
ARG2L
; ARG1H * ARG2L ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2, F
;
CLRF
WREG
;
ADDWFC
RES3, F
;
RES3:RES0
=
ARG1H:ARG1L
ARG2H:ARG2L
=
(ARG1H
ARG2H 216) +
(ARG1H
ARG2L 28) +
(ARG1L
ARG2H 28) +
(ARG1L
ARG2L)
MOVF
ARG1L, W
MULWF
ARG2L
; ARG1L * ARG2L ->
; PRODH:PRODL
MOVFF
PRODH, RES1
;
MOVFF
PRODL, RES0
;
MOVF
ARG1H, W
MULWF
ARG2H
; ARG1H * ARG2H ->
; PRODH:PRODL
MOVFF
PRODH, RES3
;
MOVFF
PRODL, RES2
;
MOVF
ARG1L, W
MULWF
ARG2H
; ARG1L * ARG2H ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2, F
;
CLRF
WREG
;
ADDWFC
RES3, F
;
MOVF
ARG1H, W
;
MULWF
ARG2L
; ARG1H * ARG2L ->
; PRODH:PRODL
MOVF
PRODL, W
;
ADDWF
RES1, F
; Add cross
MOVF
PRODH, W
; products
ADDWFC
RES2, F
;
CLRF
WREG
;
ADDWFC
RES3, F
;
BTFSS
ARG2H, 7
; ARG2H:ARG2L neg?
BRA
SIGN_ARG1
; no, check ARG1
MOVF
ARG1L, W
;
SUBWF
RES2
;
MOVF
ARG1H, W
;
SUBWFB
RES3
;
SIGN_ARG1
BTFSS
ARG1H, 7
; ARG1H:ARG1L neg?
BRA
CONT_CODE
; no, done
MOVF
ARG2L, W
;
SUBWF
RES2
;
MOVF
ARG2H, W
;
SUBWFB
RES3
;
CONT_CODE
:
RES3:RES0
=
ARG1H:ARG1L
ARG2H:ARG2L
=
(ARG1H
ARG2H 216) +
(ARG1H
ARG2L 28) +
(ARG1L
ARG2H 28) +
(ARG1L
ARG2L) +
(-1
ARG2H<7> ARG1H:ARG1L 216) +
(-1
ARG1H<7> ARG2H:ARG2L 216)
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