- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄45035 > M37542M2V-XXXGP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 PDF資料下載
參數(shù)資料
| 型號(hào)： | M37542M2V-XXXGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP32 |
| 封裝： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件頁(yè)數(shù)： | 31/139頁(yè) |
| 文件大?。?/td> | 1448K |
| 代理商： | M37542M2V-XXXGP |
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)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)當(dāng)前第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)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)
7542 Group
Rev.3.02
Oct 31, 2006
Page 126 of 134
REJ03B0006-0302
5. Read-modify-write instruction
Do not execute a read-modify-write instruction to the read invalid
address (SFR).
The read-modify-write instruction operates in the following se-
quence: read one-byte of data from memory, modify the data,
write the data back to original memory. The following instructions
are classified as the read-modify-write instructions in the 740
Family.
(1) Bit management instructions: CLB, SEB
(2) Shift and rotate instructions: ASL, LSR, ROL, ROR, RRF
(3) Add and subtract instructions: DEC, INC
(4) Logical operation instructions (1’s complement): COM
Add and subtract/logical operation instructions (ADC, SBC, AND,
EOR, and ORA) when T flag = “1” operate in the way as the read-
modify-write instruction. Do not execute the read invalid SFR.
<Reason>
When the read-modify-write instruction is executed to read invalid
SFR, the instruction may cause the following consequence: the in-
struction reads unspecified data from the area due to the read
invalid condition. Then the instruction modifies this unspecified
data and writes the data to the area. The result will be random
data written to the area or some unexpected event.
NOTES ON PERIPHERAL FUNCTIONS
Notes on I/O Ports
1. Setting of 32-pin version and PWQN0036KA-A package version
(1) Set direction registers of ports P26, P27, P35 and P36 to output.
(2) Select P33 for the INT1 function by the INT1 input port selec-
tion bit (bit 2 of interrupt edge selection register (address
3A16)).
(3) Be sure to set P36/INT1 input level selection bit (bit 1 of port
P1P3 control register (address 1716)) to “0”.
2. Port P0P3 drive capacity control register
The number of LED drive port (drive capacity is HIGH) is 8.
3. Pull-up control register
When using each port which built in pull-up resistor as an output
port, the pull-up control bit of corresponding port becomes invalid,
and pull-up resistor is not connected.
<Reason>
Pull-up control is effective only when each direction register is set
to the input mode.
4. Notes in stand-by state
In stand-by state*1 for low-power dissipation, do not make input
levels of an input port and an I/O port “undefined”.
Pull-up (connect the port to Vcc) or pull-down (connect the port to
Vss) these ports through a resistor.
When determining a resistance value, note the following points:
External circuit
Variation of output levels during the ordinary operation
When using a built-in pull-up resistor, note on varied current val-
ues:
When setting as an input port : Fix its input level
When setting as an output port : Prevent current from flowing out
to external.
<Reason>
The output transistor becomes the OFF state, which causes the
ports to be the high-impedance state. Note that the level becomes
“undefined” depending on external circuits.
Accordingly, the potential which is input to the input buffer in a mi-
crocomputer is unstable in the state that input levels of an input
port and an I/O port are “undefined”. This may cause power
source current.
*1 stand-by state : the stop mode by executing the STP instruction
the wait mode by executing the WIT instruction
5. Modifying output data with bit managing instruction
When the port latch of an I/O port is modified with the bit manag-
ing instruction*2, the value of the unspecified bit may be changed.
<Reason>
The bit managing instructions are read-modify-write form instruc-
tions for reading and writing data by a byte unit. Accordingly, when
these instructions are executed on a bit of the port latch of an I/O
port, the following is executed to all bits of the port latch.
As for a bit which is set for an input port :
The pin state is read in the CPU, and is written to this bit after bit
managing.
As for a bit which is set for an output port :
The bit value of the port latch is read in the CPU, and is written to
this bit after bit managing.
Note the following :
Even when a port which is set as an output port is changed for
an input port, its port latch holds the output data.
As for a bit of the port latch which is set for an input port, its
value may be changed even when not specified with a bit man-
aging instruction in case where the pin state differs from its port
latch contents.
*2 bit managing instructions : SEB, and CLB instructions
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37542M2-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37542F8SP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
| M37542F8FP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO36 |
| M37542F8GP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| M37542F4GP | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| M37542M2-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37542M4-XXXFP | 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)。