參數(shù)資料
型號(hào)： M37546G4-XXXHP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36
封裝： 6 X 6 MM, 0.50 MM PITCH, PLASTIC, WQFN-36
文件頁(yè)數(shù)： 98/103頁(yè)
文件大?。?/td> 1156K
代理商： M37546G4-XXXHP
REJ03B0160-0122 Rev.1.22 Mar 13, 2009
page 94 of 100
7546 Group
Termination of Unused Pins
1. Terminate unused pins
Perform the following wiring at the shortest possible distance (20
mm or less) from microcomputer pins.
(1) I/O ports
Set the I/O ports for the input mode and connect each pin to VCC
or VSS through each resistor of 1 k to 10 k. The port which can
select a built-in pull-up resistor can also use the built-in pull-up re-
sistor.
When using the I/O ports as the output mode, open them at “L” or
“H”.
When opening them in the output mode, the input mode of the
initial status remains until the mode of the ports is switched over
to the output mode by the program after reset. Thus, the poten-
tial at these pins is undefined and the power source current may
increase in the input mode. With regard to an effects on the sys-
tem, thoroughly perform system evaluation on the user side.
Since the direction register setup may be changed because of a
program runaway or noise, set direction registers by program
periodically to increase the reliability of program.
2. Termination remarks
(1) I/O ports setting as input mode
[1] Do not open in the input mode.
<Reason>
The power source current may increase depending on the first-
stage circuit.
An effect due to noise may be easily produced as compared with
proper termination (1) shown on the above “1. Terminate unused
pins”.
[2] Do not connect to VCC or VSS directly.
<Reason>
If the direction register setup changes for the output mode be-
cause of a program runaway or noise, a short circuit may occur.
[3] Do not connect multiple ports in a lump to VCC or VSS through
a resistor.
<Reason>
If the direction register setup changes for the output mode be-
cause of a program runaway or noise, a short circuit may occur
between ports.
Notes on Interrupts
1. Change of relevant register settings
When not requiring for the interrupt occurrence synchronous with
the following case, take the sequence shown in Fig. 4.
When switching external interrupt active edge
When switching interrupt sources of an interrupt vector address
where two or more interrupt sources are allocated
Fig. 4 Sequence of changing relevant register
<Reason>
When setting the followings, the interrupt request bit of the corre-
sponding interrupt may be set to “1”.
When switching external interrupt active edge
INT0 interrupt edge selection bit
(bit 0 of Interrupt edge selection register (address 003A16))
INT1 interrupt edge selection bit
(bit 1 of Interrupt edge selection register)
CNTR0 active edge switch bit
(bit 2 of timer X mode register (address 002B16))
Capture 0 interrupt edge selection bit
(bits 1 and 0 of capture mode register (address 002016))
Capture 1 interrupt edge selection bit
(bits 3 and 2 of capture mode register)
2. Check of interrupt request bit
When executing the BBC or BBS instruction to determine an in-
terrupt request bit immediately after this bit is set to “0”, take the
following sequence.
<Reason>
If the BBC or BBS instruction is executed immediately after an in-
terrupt request bit is cleared to “0”, the value of the interrupt
request bit before being cleared to “0” is read.
Set the corresponding interrupt enable bit to “0” (disabled) .
↓
Set the interrupt edge selection bit, active edge switch bit, or
the interrupt source selection bit.
↓
NOP (One or more instructions)
↓
Set the corresponding interrupt request bit to “0”
(no interrupt request issued).
↓
Set the corresponding interrupt enable bit to “1” (enabled).
Set the interrupt request bit to “0” (no interrupt issued)
↓
NOP (one or more instructions)
↓
Execute the BBC or BBS instruction
Fig. 5 Sequence of check of interrupt request bit
相關(guān)PDF資料
PDF描述
M37546G2GP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32
M37546G2HP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36
M37546G4-XXXSP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
M37546G4-XXXGP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32
M37547G2-XXXFP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO36
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M37546G4-XXXSP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37547G2FP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37547G2FP#U0 功能描述:MCU 2/5V 8KB 36-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 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(lèi)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(xiàn)） 包裝:帶卷 (TR)
M37547G2-XXXFP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37547G4FP 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*