- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄33795 > 4559 (Renesas Technology Corp.) SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER PDF資料下載
參數(shù)資料
| 型號： | 4559 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片4位微機(jī)的CMOS |
| 文件頁數(shù)： | 121/148頁 |
| 文件大?。?/td> | 1732K |
| 代理商： | 4559 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁當(dāng)前第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁
Rev.1.04
Aug 23, 2007
Page 74 of 146
REJ03B0188-0104
4559 Group
(4) Setup for I/O ports
Setup I/O ports using hardware and software as follows:
<Hardware>
Connect a resistor of 100
or more to an I/O port in series.
<Software>
As for an input port, read data several times by a program for
checking whether input levels are equal or not.
As for an output port or an I/O port, since the output data may
reverse because of noise, rewrite data to its output latch at
fixed periods.
Rewrite data to pull-up control registers at fixed periods.
(5) Providing of watchdog timer function by software
If a microcomputer runs away because of noise or others, it
can be detected by a software watchdog timer and the
microcomputer can be reset to normal operation. This is
equal to or more effective than program runaway detection
by a hardware watchdog timer. The following shows an
example of a watchdog timer provided by software.
In the following example, to reset a microcomputer to
normal operation, the main routine detects errors of the
interrupt processing routine and the interrupt processing
routine detects errors of the main routine.
This example assumes that interrupt processing is repeated
multiple times in a single main routine processing.
<The main routine>
Assigns a single word of RAM to a software watchdog timer
(SWDT) and writes the initial value N in the SWDT once at
each execution of the main routine. The initial value N should
satisfy the following condition:
N + 1
≥
As the main routine execution cycle may change because of
an interrupt processing or others, the initial value N should
have a margin.
Watches the operation of the interrupt processing routine by
comparing the SWDT contents with counts of interrupt
processing after the initial value N has been set.
Detects that the interrupt processing routine has failed and
determines to branch to the program initialization routine for
recovery processing in the following case:
If the SWDT contents do not change after interrupt processing.
<The interrupt processing routine>
Decrements the SWDT contents by 1 at each interrupt
processing.
Determines that the main routine operates normally when the
SWDT contents are reset to the initial value N at almost fixed
cycles (at the fixed interrupt processing count).
Detects that the main routine has failed and determines to
branch to the program initialization routine for recovery
processing in the following case:
If the SWDT contents are not initialized to the initial value N
but continued to decrement and if they reach 0 or less.
Fig 81. Watchdog timer by software
Main routine
Interrupt processing
routine errors
(SWDT)
← N
EI
Main processing
(SWDT)
= N?
≠ N
N
Interrupt processing routine
(SWDT)
← (SWDT)1
Interrupt processing
(SWDT)
≤ 0?
≤ 0
> 0
RTI
Return
Main routine
errors
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 456700000 | Terminal Block; Leaded Process Compatible:Yes |
| 457000000 | Cross Connector; Number of Positions:10; Current Rating:24 VA |
| 45714-0003 | Edge Connector,PCB Mnt,RECEPT,8 Contacts,0.507 Pitch,COMPLIANT FIT Terminal,GUIDE SLOT |
| 45714-0001 | Card Edge Connector; No. of Contacts:4; Pitch Spacing:0.508"; Contact Termination:Press-Fit; Body Material:LCP Liquid Crystal Polymer, Glass-filled; Mounting Type:Through Hole; Series:45714; Color:Black; Voltage Rating:250V RoHS Compliant: Yes |
| 45714-0002 | Card Edge Connector; No. of Contacts:6; Pitch Spacing:0.508"; Contact Termination:Press-Fit; Body Material:LCP Liquid Crystal Polymer, Glass-filled; Mounting Type:Through Hole; Series:45714; Color:Black; Voltage Rating:250V RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 4559_08 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Standard Characteristics |
| 45-590 | 制造商:GC Electronics 功能描述:Conn D-Subminiature Adapter F/F 9/15 POS ST 1 Port |
| 45-590 4/PK | 功能描述:電纜組件 DB-9F DB-15F HI DEN RoHS:否 制造商:Molex 產(chǎn)品:Power Assemblies 類型:Cable Assembly 連接器端口 A:No Connector 連接器端口 A 管腳計數(shù):4 連接器端口 B:No Connector 連接器端口 B 管腳計數(shù): 型式:Male 線規(guī) - 美國線規(guī)（AWG）:20, 28 長度:0.305 m 顏色:Black, Red |
| 4-5-5906 | 功能描述:TAPE 5906 VHB FOAM 4" X 5YD 制造商:3m (tc) 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
| 4-5-5907 | 功能描述:TAPE 5907 VHB FOAM 4" X 5YD 制造商:3m (tc) 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。
