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| 型號： | HC805P18GRS |
| 英文描述： | 68HC805P18 Technical Data |
| 中文描述： | 68HC805P18技術(shù)數(shù)據(jù) |
| 文件頁數(shù)： | 35/111頁 |
| 文件大?。?/td> | 748K |
| 代理商： | HC805P18GRS |
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GENERAL RELEASE SPECIFICATION
MOTOROLA
5-2
RESETS
MC68HC805P18
Rev. 1.0
8
2
3
4
5
6
7
8
9
10
11
12
13
14
A
16
17
18
19
20
5.3 Internal Resets
The three internally generated resets are the initial power-on reset (POR), the COP
watchdog timer, and low-voltage reset (LVR) functions.
5.3.1 Power-On Reset (POR)
The internal POR is generated at power-up to allow the clock oscillator to stabilize.
The POR is strictly for power turn-on conditions and should not be used to detect
a drop in the power supply voltage. There is a 4064 PH2 clock cycle oscillator
stabilization delay after the oscillator becomes active.
The POR will generate the RST signal and reset the MCU. The POR will also pull
the RESET pin low at the same time, allowing external devices to be reset with the
MCU. If any other reset function is active at the end of this 4064 PH2 clock cycle
delay, the RST signal will remain active until the other reset condition(s) end.
5.3.2 Computer Operating Properly (COP) Reset
When the COP watchdog timer is enabled (by MOR1, bit 0), the internal COP reset
is generated automatically by a timeout of the COP watchdog timer. This timer is
implemented with an 18-stage ripple counter that provides a time-out period of
65.5 ms when a 4-MHz oscillator is used. The COP watchdog counter is cleared
by writing a logical zero to bit zero at location $3FF0.
The COP register is shared with the most significant bit (MSB) of an
unimplemented user interrupt vector as shown in Figure 5-2. Reading this location
will return the MSB of the unimplemented user interrupt vector. Writing to this
location will clear the COP watchdog timer.
Bit 7
6
5
4
3
2
1
Bit 0
$3FF0
Read:
0
0
0
0
0
0
0
0
Write:
R
COPR
Reset:
—
—
—
—
—
—
—
—
= Unimplemented
R
= Reserved
Figure 5-2. Unimplemented Vector and
COP Watchdog Timer Register
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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| HC80-8.0MHZ | 功能描述:晶體 CRYSTAL 8MHz RoHS:否 制造商:AVX 頻率:26 MHz 容差: 頻率穩(wěn)定性:50 PPM 負(fù)載電容:8 pF 端接類型:SMD/SMT 封裝 / 箱體:1210 (3225 metric) 工作溫度范圍:- 40 C to + 150 C 尺寸:2.5 mm W x 3.2 mm L x 0.85 mm H 封裝:Reel |
| HC80U | 制造商:FOX 制造商全稱:FOX 功能描述:RESISTANCE WELD THRU-HOLE CRYSTAL |
| HC80U-3.6864MHz | 功能描述:晶體 3.6864MHz 20pF RoHS:否 制造商:AVX 頻率:26 MHz 容差: 頻率穩(wěn)定性:50 PPM 負(fù)載電容:8 pF 端接類型:SMD/SMT 封裝 / 箱體:1210 (3225 metric) 工作溫度范圍:- 40 C to + 150 C 尺寸:2.5 mm W x 3.2 mm L x 0.85 mm H 封裝:Reel |
| HC80UW | 制造商:FOX 制造商全稱:FOX 功能描述:RESISTANCE WELD MINIATURE CRYSTAL (GULLWING) |
| HC8-100-R | 功能描述:固定電感器 10uH 9.2A 43.6mOhms RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
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