- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45035 > M37542F8HP 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQCC36 PDF資料下載
參數(shù)資料
| 型號(hào)： | M37542F8HP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQCC36 |
| 封裝： | 6 X 6 MM, 0.50 MM PITCH, PLASTIC, WQFN-36 |
| 文件頁(yè)數(shù)： | 14/122頁(yè) |
| 文件大?。?/td> | 1311K |
| 代理商： | M37542F8HP |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)當(dāng)前第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)
7542 Group
Rev.3.03
Jul 11, 2008
Page 110 of 117
REJ03B0006-0303
6. Direction register
The values of the port direction registers cannot be read.
That is, it is impossible to use the LDA instruction, memory opera-
tion instruction when the T flag is “1”, addressing mode using
direction register values as qualifiers, and bit test instructions such
as BBC and BBS.
It is also impossible to use bit operation instructions such as CLB
and SEB and read-modify-write instructions of direction registers
for calculations such as ROR.
For setting direction registers, use the LDM instruction, STA in-
struction, etc.
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 Figure 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 3A16))
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 2B16))
Capture 0 interrupt edge selection bit
(bits 1 and 0 of capture mode register (address 2016))
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 |
|---|---|
| M37544G2ASP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37544G2ASP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37544G2GP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37544G2SP | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37545G2KP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37542F8SP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542F8SP#U0 | 制造商:Renesas Electronics Corporation 功能描述:MCU 4.0/5.5V 32K PB-FREE 32-SDIP - Trays |
| M37542M2-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M2-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M2-XXXHP | 制造商:RENESAS 制造商全稱: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)。