- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69026 > MC68HC05J3CP (FREESCALE SEMICONDUCTOR INC) 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20 PDF資料下載
參數(shù)資料
| 型號： | MC68HC05J3CP |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數(shù)： | 48/92頁 |
| 文件大?。?/td> | 912K |
| 代理商： | MC68HC05J3CP |
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頁當(dāng)前第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
MOTOROLA
7-2
MC68HC05J3
RESETS AND INTERRUPTS
7
7.1.1
Power-on reset
A power-on reset occurs when a positive transition is detected on VDD. The power-on reset
function is strictly for power turn-on conditions and should not be used to detect drops in the power
supply voltage. The power-on circuitry provides a stabilization delay (tPORL) from when the
oscillator becomes active. If the external RESET pin is low at the end of this delay then the
processor remains in the reset state until RESET goes high. The user must ensure that the voltage
on VDD has risen to a point where the MCU can operate properly by the time tPORL has elapsed.
If there is doubt, the external RESET pin should remain low until the voltage on VDD has reached
the specied minimum operating voltage. This may be accomplished by connecting an external
RC-circuit to this pin to generate a power-on reset (POR). In this case, the time constant must be
great enough (at least 100ms) to allow the oscillator circuit to stabilize.
7.1.2
RESET pin
When the oscillator is running in a stable state, the MCU is reset when a logic zero is applied to
the RESET input for a minimum period of 1.5 machine cycles (tCYC). This pin contains an internal
Schmitt trigger as part of its input to improve noise immunity. When the RESET pin goes high, the
MCU will resume operation on the following cycle.
7.1.3
Computer operating properly (COP) reset
The MCU contains a watchdog timer that automatically times out if not reset (cleared) within a
specic time by a program reset sequence.
Note:
COP timeout is prevented by periodically writing a ‘0’ to bit 0 of address $0FF0.
If the COP watchdog timer is allowed to timeout, an internal reset is generated to reset the MCU.
Because the internal reset signal is used, the MCU comes out of a COP reset in the same
operating mode it was in when the COP timeout was generated.
The COP reset function is enabled or disabled by a mask option (see Section 1.2).
TPG
49
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC05J3DW | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20 |
| MC68HC05J3CDW | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20 |
| MC68HC05JB3DW | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC05JB3JDW | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| MC68HC05JB3JP | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDIP20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05J3DW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit |
| MC68HC05J3P | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit |
| MC68HC05J5A | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-bit microcontroller units |
| MC68HC05J5ADW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-bit microcontroller units |
| MC68HC05J5AJDW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:8-bit microcontroller units |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。