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參數(shù)資料
| 型號(hào)： | M37540E8GP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 34/64頁 |
| 文件大?。?/td> | 668K |
| 代理商： | M37540E8GP |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7540 Group
MITSUBISHI MICROCOMPUTERS
34
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Watchdog Timer
The watchdog timer gives a means for returning to a reset status
when the program fails to run on its normal loop due to a runaway.
The watchdog timer consists of an 8-bit watchdog timer H and an 8-
bit watchdog timer L, being a 16-bit counter.
Standard operation of watchdog timer
The watchdog timer stops when the watchdog timer control register
(address 0039
16
) is not set after reset. Writing an optional value to
the watchdog timer control register (address 0039
16
) causes the
watchdog timer to start to count down. When the watchdog timer H
underflows, an internal reset occurs. Accordingly, it is programmed
that the watchdog timer control register (address 0039
16
) can be set
before an underflow occurs.
When the watchdog timer control register (address 0039
16
) is read,
the values of the high-order 6-bit of the watchdog timer H, STP in-
struction disable bit and watchdog timer H count source selection bit
are read.
Initial value of watchdog timer
By a reset or writing to the watchdog timer control register (address
0039
16
), the watchdog timer H is set to “FF
16
” and the watchdog
timer L is set to “FF
16
”.
Operation of watchdog timer H count source selection bit
A watchdog timer H count source can be selected by bit 7 of the
watchdog timer control register (address 0039
16
). When this bit is
“0”, the count source becomes a watchdog timer L underflow signal.
The detection time is 131.072 ms at f(X
IN
)=8 MHz.
When this bit is “1”, the count source becomes f(X
IN
)/16. In this
case, the detection time is 512 μs at f(X
IN
)=8 MHz.
This bit is cleared to “0” after reset.
Operation of STP instruction disable bit
When the watchdog timer is in operation, the STP instruction can be
disabled by bit 6 of the watchdog timer control register (address
0039
16
).
When this bit is “0”, the STP instruction is enabled.
When this bit is “1”, the STP instruction is disabled, and an internal
reset occurs if the STP instruction is executed.
Once this bit is set to “1”, it cannot be changed to “0” by program.
This bit is cleared to “0” after reset.
Fig. 38 Block diagram of watchdog timer
Fig. 39 Structure of watchdog timer control register
X
IN
Data bus
“0”
“1”
Watchdog timer H count
source selection bit
1/16
Reset
circuit
STP Instruction disable bit
STP Instruction
Watchdog timer H (8)
Write "FF
16
" to the
watchdog timer
control register
Internal reset
RESET
Watchdog timer L (8)
Write “FF
16
” to the
watchdog timer
control register
Watchdog timer control register
(WDTCON: address 0039
16
)
Watchdog timer H (read only for high-order 6-bit)
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(X
IN
)/16
b7 b0
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相關(guān)代理商/技術(shù)參數(shù) |
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| M37540E8GP#U0 | 功能描述:IC 7540 MCU OTP 32K 32LQFP 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(xùn)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(biāo)準(zhǔn)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(chǔ)器容量:384KB（384K x 8） 程序存儲(chǔ)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 |
| M37540E8SP | 制造商:Renesas Electronics Corporation 功能描述: |
| M37540E8T-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37540E8T-XXXGP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540E8V-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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