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| 型号： | M38K09F8LHP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 12 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64 |
| 文件页数： | 106/133页 |
| 文件大小： | 1359K |
| 代理商： | M38K09F8LHP |
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38K0 Group
Rev.3.00
Oct 05, 2006
page 74 of 129
REJ03B0192-0300
Fig. 106 Structure of Watchdog timer control register
Fig. 105 Block diagram of Watchdog timer
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 (bit 6), and
watchdog timer H count source selection bit (bit 7) are read.
Initial 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.”
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 sys-
tem clock 8 MHz frequency.
When this bit is set to “1”, the count source becomes the system
clock divided by 16. The detection time in this case is set to 512
s at system clock 8 MHz 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.
System clock
“0”
“1”
1/16
RESET
“FF16” is set when
watchdog timer
control register is
written to.
Watchdog timer L (8)
Watchdog timer H count
source selection bit
Watchdog timer H (8)
Data bus
“FF16” is set when
watchdog timer
control register is
written to.
STP instruction disable bit
STP instruction
Reset circuit
Internal reset
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: System clock/16
Watchdog timer H (for read-out of high-order 6 bit)
Watchdog timer control register
(WDTCON : address 003916)
b7
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相关代理商/技术参数 |
参数描述 |
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| M38K09F8LHP#U0 | 功能描述:MCU 3/5V 32K PB-FREE AH570264-LQ RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 产品培训模块:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 标准包装:1 系列:M16C™ M32C/80/87 核心处理器:M32C/80 芯体尺寸:16/32-位 速度:32MHz 连通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外围设备:DMA，POR，PWM，WDT 输入/输出数:121 程序存储器容量:384KB（384K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:24K x 8 电压 - 电源 (Vcc/Vdd):3 V ~ 5.5 V 数据转换器:A/D 34x10b，D/A 2x8b 振荡器型:内部 工作温度:-20°C ~ 85°C 封装/外壳:144-LQFP 包装:托盘 产品目录页面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87 |
| M38K09RFS | 功能描述:EMULATOR MCU FOR 38K0 GROUP RoHS:否 类别:编程器，开发系统 >> 内电路编程器、仿真器以及调试器 系列:- 产品变化通告:Development Systems Discontinuation 19/Jul/2010 标准包装:1 系列:* 类型:* 适用于相关产品:* 所含物品:* |
| M38K29F8LHP | 功能描述:IC 740 MCU FLASH 32K 64LQFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 产品培训模块:MCU Product Line Introduction XMEGA Introduction AVR XMEGA USB Connectivity 标准包装:90 系列:AVR® XMEGA 核心处理器:AVR 芯体尺寸:8/16-位 速度:32MHz 连通性:I²C，IrDA，SPI，UART/USART 外围设备:欠压检测/复位，DMA，POR，PWM，WDT 输入/输出数:50 程序存储器容量:192KB（96K x 16） 程序存储器类型:闪存 EEPROM 大小:4K x 8 RAM 容量:16K x 8 电压 - 电源 (Vcc/Vdd):1.6 V ~ 3.6 V 数据转换器:A/D 16x12b; D/A 2x12b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:64-TQFP 包装:托盘 配用:ATSTK600-RC14-ND - STK600 SOCKET/ADAPTER 64TQFPATSTK600-TQFP64-ND - STK600 SOCKET/ADAPTER 64-TQFPATAVRONEKIT-ND - KIT AVR/AVR32 DEBUGGER/PROGRMMRATAVRISP2-ND - PROGRAMMER AVR IN SYSTEM |
| M38K29F8LHP#U0 | 功能描述:IC 740/38K2 MCU FLASH 64-LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 产品培训模块:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 标准包装:1 系列:M16C™ M32C/80/87 核心处理器:M32C/80 芯体尺寸:16/32-位 速度:32MHz 连通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外围设备:DMA，POR，PWM，WDT 输入/输出数:121 程序存储器容量:384KB（384K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:24K x 8 电压 - 电源 (Vcc/Vdd):3 V ~ 5.5 V 数据转换器:A/D 34x10b，D/A 2x8b 振荡器型:内部 工作温度:-20°C ~ 85°C 封装/外壳:144-LQFP 包装:托盘 产品目录页面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87 |
| M38K29F8LHP#UO | 制造商:Renesas Electronics Corporation 功能描述: |
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