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参数资料
| 型号： | M37545G4-XXXGP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32 |
| 封装： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件页数： | 30/65页 |
| 文件大小： | 782K |
| 代理商： | M37545G4-XXXGP |
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Rev.1.07
Mar 19, 2009
Page 34 of 60
REJ03B0140-0107
7545 Group
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.
1. Standard operation of watchdog timer
The watchdog timer is valid by setting “0” to bit 0 of the
Function set ROM data (address FFDA16) of the built-in
QzROM.
When an internal clock is supplied after waiting the oscillation
stabilizing time by timer 1 after system is released from reset, the
watchdog timer starts operation. When the watchdog timer H
underflows, an internal reset occurs. Accordingly, it is
programmed that the watchdog timer control register (address
003916) can be set before an underflow occurs.
When the watchdog timer control register (address 003916) is
read, the values of the high-order 6-bit of the watchdog timer H
and watchdog timer H count source selection bit are read.
2. Initial value of watchdog timer
By a reset or writing to the watchdog timer control register
(address 003916), the watchdog timer H is set to “FF16” and the
watchdog timer L is set to “FF16”.
3. 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 003916). When this bit
is “0”, the count source becomes a watchdog timer L underflow
signal. The detection time is 262.144 ms at f(XIN) = 4 MHz.
When this bit is “1”, the count source becomes f(XIN)/16. In this
case, the detection time is 1024
s at f(XIN) = 4 MHz.
This bit is cleared to “0” after reset.
4. STP instruction function selection bit
The function of the STP instruction can be selected by the bit 1 in
FSROM. This bit cannot be used for rewriting by executing the
STP instruction.
When this bit is set to “0”, internal reset occurs by executing
the STP instruction.
When this bit is set to “1”, stop mode is entered by executing
the STP instruction.
<Notes on Watchdog Timer>
1. The watchdog timer is operating during the wait mode.
Write data to the watchdog timer control register to prevent
timer underflow.
2. The watchdog timer stops during the stop mode. However,
the watchdog timer is running during the oscillation stabi-
lizing time after the STP instruction is released. In order to
avoid the underflow of the watchdog timer, the watchdog
timer H count source selection bit (bit 7 of watchdog timer
control register (address 003916)) must be set to “0” just
before executing the STP instruction.
Fig. 33 Structure of watchdog timer control register
b7
b0
Watchdog timer H (read only for high-order 6-bit)
Watchdog timer H count source selection bit
0 : Watchdog timer L underflow
1 : f(XIN)/16
Watchdog timer control register
(WDTCON: address 003916, initial value: 3F16)
Disable (returns “0” when read)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37545G6GP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G6GP#U0 | 功能描述:MCU 3/5V 24K 32-LQFP QZ-ROM RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 标准包装:250 系列:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI，I²C，UART/USART 外围设备:POR，PWM，WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC（J 形引线） 包装:带卷 (TR) |
| M37545G6KP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G6-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G8GP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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