- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45046 > M38504E6FP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO42 PDF資料下載
參數(shù)資料
| 型號： | M38504E6FP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁數(shù)： | 20/55頁 |
| 文件大?。?/td> | 867K |
| 代理商： | M38504E6FP |
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頁當前第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
24
3850 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
WATCHDOG TIMER
The watchdog timer gives a mean of returning to the reset status
when a program cannot run on a normal loop (for example, be-
cause of a software run-away). The watchdog timer consists of an
8-bit watchdog timer L and an 8-bit watchdog timer H.
Standard Operation of Watchdog Timer
When any data is not written into the watchdog timer control reg-
ister (address 003916) after resetting, the watchdog timer is in the
stop state. The watchdog timer starts to count down by writing an
optional value into the watchdog timer control register (address
003916) and an internal reset occurs at an underflow of the watch-
dog timer H.
Accordingly, programming is usually performed so that writing to
the watchdog timer control register (address 003916) may be
started before an underflow. When the watchdog timer control reg-
ister (address 003916) is read, the values of the high-order 6 bits
of the watchdog timer H, STP instruction disable bit, and watch-
dog timer H count source selection bit are read.
qInitial value of watchdog timer
At reset or writing to the watchdog timer control register (address
003916), each watchdog timer H and L is set to “FF16.”
Fig. 28 Structure of Watchdog timer control register
qWatchdog timer H count source selection bit operation
Bit 7 of the watchdog timer control register (address 003916) per-
mits selecting a watchdog timer H count source. When this bit is
set to “0”, the count source becomes the underflow signal of
watchdog timer L. The detection time is set to 131.072 ms at f(XIN)
= 8 MHz frequency and 32.768 s at f(XCIN) = 32 kHz frequency.
When this bit is set to “1”, the count source becomes the signal
divided by 16 for f(XIN) (or f(XCIN)). The detection time in this case
is set to 512
s at f(XIN) = 8 MHz frequency and 128 ms at f(XCIN)
= 32 kHz frequency. This bit is cleared to “0” after resetting.
qOperation of STP instruction disable bit
Bit 6 of the watchdog timer control register (address 003916) per-
mits disabling the STP instruction when the watchdog timer is in
operation.
When this bit is “0”, the STP instruction is enabled.
When this bit is “1”, the STP instruction is disabled, once the STP
instruction is executed, an internal reset occurs. When this bit is
set to “1”, it cannot be rewritten to “0” by program. This bit is
cleared to “0” after resetting.
Fig. 27 Block diagram of Watchdog timer
XIN
Data bus
XCIN
“10”
“00”
“01”
Main clock division
ratio selection bits
(Note)
“0”
“1”
1/16
Watchdog timer H count
source selection bit
Reset
circuit
STP instruction disable bit
Watchdog timer H (8)
“FF16” is set when
watchdog timer
control register is
written to.
Internal reset
RESET
Watchdog timer L (8)
Note: Any one of high-speed, middle-speed or low-speed mode is selected by bits 7 and 6 of the CPU mode register.
STP instruction
“FF16” is set when
watchdog timer
control register is
written to.
b0
STP instruction disable bit
0: STP instruction enabled
1: STP instruction disabled
Watchdog timer H count source selection bit
0: Watchdog timer L underflow
1: f(XIN)/16 or f(XCIN)/16
Watchdog timer H (for read-out of high-order 6 bit)
Watchdog timer control register
(WDTCON : address 003916)
b7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M38504M6-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| M38504E6-XXXSP | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| M38503E4-XXXSP | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP42 |
| M38504M6A-XXXFP | 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PDSO42 |
| M38503M2A-XXXFP | 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PDSO42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M38504E6FP#U0 | 功能描述:MCU 4.0/5.5V 24K PB-FREE 42-SSOP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 產(chǎn)品培訓模塊:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 標準包裝:1 系列:M16C™ M32C/80/87 核心處理器:M32C/80 芯體尺寸:16/32-位 速度:32MHz 連通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外圍設(shè)備:DMA，POR，PWM，WDT 輸入/輸出數(shù):121 程序存儲器容量:384KB（384K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:24K x 8 電壓 - 電源 (Vcc/Vdd):3 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 34x10b，D/A 2x8b 振蕩器型:內(nèi)部 工作溫度:-20°C ~ 85°C 封裝/外殼:144-LQFP 包裝:托盤 產(chǎn)品目錄頁面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87 |
| M38504M6202F | 制造商:Panasonic Industrial Company 功能描述:SUB ONLY IC |
| M38504M6211F | 制造商:Panasonic Industrial Company 功能描述:IC SUB FOR P-M38504M6202F |
| M38507ARLSS | 功能描述:M-SUPPORT TOOL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program RoHS指令信息:IButton RoHS Compliance Plan 標準包裝:1 系列:- 附件類型:USB 至 1-Wire? RJ11 適配器 適用于相關(guān)產(chǎn)品:1-Wire? 設(shè)備 產(chǎn)品目錄頁面:1429 (CN2011-ZH PDF) |
| M38507F8AFP#U1 | 功能描述:IC 740/3850 MCU FLASH 42SSOP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 產(chǎn)品培訓模塊:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 標準包裝:1 系列:M16C™ M32C/80/87 核心處理器:M32C/80 芯體尺寸:16/32-位 速度:32MHz 連通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外圍設(shè)備:DMA，POR，PWM，WDT 輸入/輸出數(shù):121 程序存儲器容量:384KB（384K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:24K x 8 電壓 - 電源 (Vcc/Vdd):3 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 34x10b，D/A 2x8b 振蕩器型:內(nèi)部 工作溫度:-20°C ~ 85°C 封裝/外殼:144-LQFP 包裝:托盤 產(chǎn)品目錄頁面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。