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參數(shù)資料
| 型號： | M37548G2-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, LSSOP-20 |
| 文件頁數(shù)： | 48/84頁 |
| 文件大?。?/td> | 1427K |
| 代理商： | M37548G2-XXXFP |
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Rev.2.02
Mar 31, 2009
Page 52 of 81
REJ03B0210-0202
7548 Group
Oscillation stop detection circuit
The oscillation stop detection circuit is used to detect an
oscillation stop when a ceramic resonator or oscillation circuit
stops due to disconnection. To use the oscillation stop detection
circuit, set the low-speed on-chip oscillator to start operating.
The oscillation stop detection circuit is enabled by setting the
XIN oscillation stop detection function active bit to 1. While this
circuit is enabled, the operating status of the XIN oscillation
circuit is monitored using the low-speed on-chip oscillator. If an
oscillation stop is detected, the oscillation stop detection status
bit is set to 1. If the oscillation stop detection reset enable bit is
also set to 1, an internal reset is triggered at oscillation stop
detection.
The XIN oscillation stop detection function active bit and the
oscillation stop detection status bit are not initialized if an
oscillation stop detection reset is triggered and these bits retain
their value of 1. Since these bits are initialized to 0 by an external
reset, an oscillation stop detection reset can be determined by
checking the oscillation stop status bit.
The oscillation stop detection status bit is set to 0 by writing 0 to
the XIN oscillation stop detection function enable bit.
To enable the oscillation detection circuit, first write 0 to the XIN
oscillation stop detection function enable bit and set the
oscillation stop detection status bit to 0. Then set the oscillation
stop function to 1.
The XIN oscillation and external clock input are set as the clocks
for oscill ati o n stop detect ion. Refer t o the el ectrica l
characteristics for the frequencies for oscillation stop detection.
Fig 68. Structure of oscillation stop detection register
Notes
(1) Do not execute the transition to “state 2’a” shown in Figure
this state, no reset is triggered and the MCU is stopped even
when the XIN oscillation stops.
(2) After an oscillation stop detection reset, if this reset is
enabled while bits XIN oscillation stop detection function
active and oscillation stop detection status are retained, a
reset is triggered again.
(3) The oscillation stop detection status bit is initialized under
the following conditions:
External reset, power-on reset, low-voltage detection reset,
watchdog timer reset, and reset by the STP instruction
function.
Write 0 to the XIN oscillation stop detection function active
bit
(4) While the oscillation stop detection function is in active, the
oscillation stop detection status bit may set to 1 when the
watchdog timer underflows or by a reset when the STP
instruction is executed with the STP instruction function
selection bit set to 1.
When an oscillation stop detection reset is triggered,
reconfirm that oscillation is stopped.
(5) The oscillation stop detection circuit is not included in the
emulator MCU “M37549RLSS”.
XIN oscillation stop detection function active bit
0: Detection function inactive
1: Detection function active
Oscillation stop detection reset enable bit
0: Oscillation stop detection reset disabled
1: Oscillation stop detection reset enabled
Oscillation stop detection status bit
0: Oscillation stop not detected
1: Oscillation stop detected
Not used (“0” at reading)
b7
Oscillation stop detection register
(CLKSTP: address 003816, initial value: 0016)
b0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37548G3FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37548G3FP#U0 | 功能描述:MCU 6K ROM 256K 20-SSOP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 標準包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設(shè)備:欠壓檢測/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲器容量:96KB（96K x 8） 程序存儲器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587 |
| M37548G3-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37549G1FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37549G1-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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