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参数资料
| 型号： | ST72C254G1M6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
| 封装： | 0.300 INCH, PLASTIC, SOIC-28 |
| 文件页数： | 51/136页 |
| 文件大小： | 929K |
| 代理商： | ST72C254G1M6 |
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ST72104G, ST72215G, ST72216G, ST72254G
21/136
7.5 CLOCK RESET AND SUPPLY REGISTER DESCRIPTION (CRSR)
Read/Write
Reset Value: 000x 000x (XXh)
Bit 7:5 = Reserved, always read as 0.
Bit 4 = LVDRF
LVD reset flag
This bit indicates that the last RESET was gener-
ated by the LVD block. It is set by hardware (LVD
reset) and cleared by software (writing zero). See
WDGRF flag description for more details. When
the LVD is disabled by option byte, the LVDRF bit
value is undefined.
Bit 3 = Reserved, always read as 0.
Bit 2 = CSSIE
Clock security syst
.
interrupt enable
This bit enables the interrupt when a disturbance
is detected by the clock security system (CSSD bit
set). It is set and cleared by software.
0: Clock security system interrupt disabled
1: Clock security system interrupt enabled
Refer to Table 5, “Interrupt Mapping,” on page 24
for more details on the CSS interrupt vector. When
the CSS is disabled by option byte, the CSSIE bit
has no effect.
Bit 1 = CSSD
Clock security system detection
This bit indicates that the safe oscillator of the
clock security system block has been selected by
hardware due to a disturbance on the main clock
signal (fOSC). It is set by hardware and cleared by
reading the CRSR register when the original oscil-
lator recovers.
0: Safe oscillator is not active
1: Safe oscillator has been activated
When the CSS is disabled by option byte, the
CSSD bit value is forced to 0.
Bit 0 = WDGRF
Watchdog reset flag
This bit indicates that the last RESET was gener-
ated by the watchdog peripheral. It is set by hard-
ware (Watchdog RESET) and cleared by software
(writing zero) or an LVD RESET (to ensure a sta-
ble cleared state of the WDGRF flag when the
CPU starts).
Combined with the LVDRF flag information, the
flag description is given by the following table.
Application notes
The LVDRF flag is not cleared when another RE-
SET type occurs (external or watchdog), the
LVDRF flag remains set to keep trace of the origi-
nal failure.
In this case, a watchdog reset can be detected by
software while an external reset can not.
Table 4. Clock, Reset and Supply Register Map and Reset Values
70
00
0
LVD
RF
0
CSS
IE
CSS
D
WDG
RF
RESET Sources
LVDRF
WDGRF
External RESET pin
0
Watchdog
0
1
LVD
1
X
Address
(Hex.)
Register
Label
765
4
321
0
0025h
CRSR
Reset Value
0
LVDRF
x0
CSSIE
0
CSSD
0
WDGRF
x
相关PDF资料 |
PDF描述 |
|---|---|
| ST72C254G2M3 | 8-BIT, FLASH, 6 MHz, MICROCONTROLLER, PDSO28 |
| ST72C254G2M7 | 8-BIT, FLASH, 6 MHz, MICROCONTROLLER, PDSO28 |
| ST72C254G2M1 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28 |
| ST72C254G1B1 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72C254G2B1 | 制造商:STMicroelectronics 功能描述:8-BIT MICROCONTROLLER - Bulk |
| ST72C254G2B6 | 功能描述:8位微控制器 -MCU Flash 8K SPI/I2C RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C254G2B6 | 制造商:STMicroelectronics 功能描述:8BIT MCU FLASH 8K 72C254 DIP32 |
| ST72C254G2M3 | 功能描述:8位微控制器 -MCU ST72104G ST72215G ST72254G 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C254G2M3/TR | 功能描述:8位微控制器 -MCU 8B MCU SINGLE VLTG FLASH MEMORY RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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