- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄380060 > CR16MES544VE (National Semiconductor Corporation) Family of CompactRISC 16-Bit Microcontrollers PDF資料下載
參數(shù)資料
| 型號： | CR16MES544VE |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 16位微控制器 |
| 英文描述： | Family of CompactRISC 16-Bit Microcontrollers |
| 中文描述： | 家庭CompactRISC 16位微控制器 |
| 文件頁數(shù)： | 39/99頁 |
| 文件大?。?/td> | 449K |
| 代理商： | CR16MES544VE |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁當(dāng)前第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁
39
www.national.com
off during power-save operation, thus reducing power con-
sumption and radiated emissions. This can be done only if
the module detects a toggling low-speed oscillator. If the low-
speed oscillator is not operating, the prescaler remains avail-
able as the slow clock source.
11.4
POWER-ON RESET
The Power-On Reset circuit generates a system reset signal
upon power-up and holds the signal active for a period of
time to allow the crystal oscillator to stabilize. The circuit de-
tects a power turn-on condition, which presets the 14-bit tim-
er to 3FFF hex. Once oscillation starts and the clock
becomes active, the timer starts counting down. When the
count reaches zero, the 14-bit timer stops counting and the
internal reset signal is deactivated (unless the RESET pin is
held low).
The circuit sets a power-on reset flag bit upon detection of a
power-on condition. The CPU can read this flag to determine
whether a reset was caused by a power-up or by the RESET
input.
Note:
Power-On Reset circuit cannot be used to detect a
drop in the supply voltage.
11.5
EXTERNAL RESET
An active-low reset input pin called RESET allows the device
to be reset at any time. When the signal goes low, it gener-
ates an internal system reset signal that remains active until
the RESET signal goes high again.
11.6
DUAL CLOCK AND RESET REGISTERS
The Dual Clock and Reset module (CLK2RES) contains two
registers: the Clock and Reset Control register (CRCTRL)
and the Slow Clock Prescaler register (PRSSC).
11.6.1
Clock and Reset Control Register (CRCTRL) is a byte-wide
read/write register that contains the power-on reset flag and
selects the type of slow clock. The register format is shown
below.
7
6
5
4
Reserved
Clock and Reset Control Register (CRCTRL)
SCLK
Slow Clock Select. When this bit is set to 1, the
32.728 kHz oscillator is used for the slow clock.
When this bit is cleared to 0, the prescaled
main clock is used for the slow clock. Upon re-
set, this bit is cleared to 0.
Power-On Reset. This bit is set to 1 by the
hardware when a power-on condition is detect-
ed, allowing the CPU to determine whether a
power-up has occurred. The CPU can clear
this bit to 0 but cannot set it to 1. Any attempt
by the CPU to set this bit is ignored.
POR
11.7
SLOW CLOCK PRESCALER REGISTER
(PRSSC)
The Slow Clock Prescaler (PRSSC) register is a byte-wide
read/write register that holds the clock divisor used to gener-
ate the slow clock from the main clock. The format of the reg-
ister is shown below.
7
6
5
4
SCDIV
SCDIV
Slow Clock Divisor. If the clock divider is en-
abled (CRCTRL.SCLK=0), the main clock is di-
vided by (SCDIV+1)*2 to produce the slow
system clock. Upon reset, PRSSC register is
set to FF hex.
3
2
1
0
POR
SCLK
3
2
1
0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CR16MES544VI | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES9 | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944V8 | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944VE | Family of CompactRISC 16-Bit Microcontrollers |
| CR18 | TAD THICK FILM CHIP RESISTORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CR16MES544VI | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES9 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944V8 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944VE | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944VI | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。