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參數(shù)資料
| 型號(hào)： | 90S1200 |
| 廠商： | Atmel Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash |
| 中文描述： | 位AVR微控制器具有8K字節(jié)的系統(tǒng)內(nèi)可編程閃存 |
| 文件頁數(shù)： | 13/71頁 |
| 文件大?。?/td> | 1416K |
| 代理商： | 90S1200 |
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13
AT90S1200
0838H
–
AVR
–
03/02
Figure 13.
Reset Logic
Note:
1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling).
Power-on Reset
A Power-on Reset (POR) circuit ensures that the device is reset from power-on. As
shown in Figure 13, an internal timer clocked from the Watchdog timer oscillator pre-
vents the MCU from starting until after a certain period after V
CC
has reached the Power-
on Threshold voltage (V
POT
), regardless of the V
CC
rise time (see Figure 14).
Figure 14.
MCU Start-up, RESET Tied to V
CC
.
If the built-in start-up delay is sufficient, RESET can be connected to V
CC
directly or via
an external pull-up resistor. By holding the RESET pin low for a period after V
CC
has
Table 3.
Reset Characteristics (V
CC
= 5.0V)
Symbol
Parameter
Min
Typ
Max
Units
V
POT
(1)
Power-on Reset Threshold Voltage (rising)
0.8
1.2
1.6
V
Power-on Reset Threshold Voltage (falling)
0.2
0.4
0.6
V
V
RST
Pin Threshold Voltage
–
–
0.85 V
CC
V
t
POR
Power-on Reset Period
2.0
3.0
4.0
ms
t
TOUT
Reset Delay Time-out Period (The Time-out
period equals 16K WDT cycles. See
“
Typical
”
on page 51. for typical WDT
frequency at different voltages).
11.0
16.0
21.0
ms
V
CC
Power-on Reset
Circuit
RESET
POR
100 - 500K
Reset Circuit
Watchdog
Timer
On-chip
RC Oscillator
C
14-stage Ripple Counter
Time-out
S
Q
R
Q
I
VCC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
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