参数资料
型号: AT90S1200-4PI
厂商: ATMEL CORP
元件分类: 微控制器/微处理器
英文描述: -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
中文描述: 8-BIT, FLASH, 4 MHz, RISC MICROCONTROLLER, PDIP20
封装: 0.300 INCH, PLASTIC, DIP-20
文件页数: 13/71页
文件大小: 1416K
代理商: AT90S1200-4PI
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
Characteristics
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
相关PDF资料
PDF描述
AT90S1200-4SC -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
AT90S1200-4SI -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
AT90S1200-4YC -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
AT90S1200-4YI -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
AT90S1200A -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
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AT90S1200-4SC 功能描述:8位微控制器 -MCU 1k bit 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
AT90S1200-4SI 功能描述:8位微控制器 -MCU 1K Flash 3V 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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