參數(shù)資料
型號(hào)： R5F21274JFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP32
封裝： 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32
文件頁數(shù)： 33/52頁
文件大?。?/td> 620K
代理商： R5F21274JFP
56
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
The following example shows how interrupts are moved.
12.3
Register description
12.3.1
MCUCR – MCU Control Register
Note:
1. Only available in the picoPower devices ATmega165PA/325PA/3250PA/645P/6450P.
Bit 1 – IVSEL: Interrupt Vector Select
When the IVSEL bit is cleared (zero), the Interrupt Vectors are placed at the start of the Flash memory. When this
bit is set (one), the Interrupt Vectors are moved to the beginning of the Boot Loader section of the Flash. The actual
address of the start of the Boot Flash Section is determined by the BOOTSZ Fuses. Refer to the section ”Boot
Bit 0 – IVCE: Interrupt Vector Change Enable
The IVCE bit must be written to logic one to enable change of the IVSEL bit. IVCE is cleared by hardware four
cycles after it is written or when IVSEL is written. Setting the IVCE bit will disable interrupts, as explained in the
Assembly code example
Move_interrupts:
; Get MCUCR
in
r16, MCUCR
mov
r17, r16
; Enable change of Interrupt Vectors
ori
r16, (1<<IVCE)
out
MCUCR, r16
; Move interrupts to Boot Flash section
ori
r17, (1<<IVSEL)
out
MCUCR, r17
ret
C code example
void
Move_interrupts(void)
{
uchar temp;
/* Get MCUCR*/
temp = MCUCR;
/* Enable change of Interrupt Vectors */
MCUCR = temp | (1<<IVCE);
/* Move interrupts to Boot Flash section
*/ MCUCR = temp | (1<<IVSEL);
}
Bit
7
654
3
2
1
0
0x35 (0x55)
JTD
BODS
BODSE
PUD
–
IVSEL
IVCE
MCUCR
Read/Write
R/W
RR
R/W
RR
R/W
Initial Value
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R5F21274JFP#U0 功能描述:MCU FLASH 2K FLASH 16K 32LQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:R8C/2x/27 標(biāo)準(zhǔn)包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設(shè)備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲(chǔ)器容量:- 程序存儲(chǔ)器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR)
R5F21274JFP#W4 制造商:Renesas Electronics Corporation 功能描述:MCU 3/5V - Tape and Reel
R5F21274JXXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MCU
R5F21274KFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES
R5F21274KXXXFP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 16-BIT CMOS MCU
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