参数资料
型号: AT89EB5114
厂商: Atmel Corp.
元件分类: 8位微控制器
英文描述: Low-pin-count 8-bit microcontroller with A/D converter
中文描述: 低引脚数的8 - A / D转换位微控制器
文件页数: 10/95页
文件大小: 1126K
代理商: AT89EB5114
10
4311A–8051–01/05
Figure 3.
Power-Up and Steady-state Conditions Monitored
The POR/PFD forces the CPU into reset mode when VCC reaches a voltage condition
which is out of specification.
The thresholds and their functions are:
VPFDP: the Vcc has reached a minimum functional value at power-up. The circuit
leaves the RESET mode
VPFDM: the Vcc has reached a low threshold functional value for the
microcontroller. An internal RESET is set.
Glitch filtering prevents the system from RESET when short duration glitches are carried
on Vcc power-supply (See “Electrical Characteristics” on page 84.).
In case Vcc is below VPFDP, LOWVD bit in AUXR (See Table 12 on page 23) is cleared
by hardware. This bit allows the user to know if the voltage is below VPFDP.
Note: For proper reset operation V
CCA
and V
CC
must be considered together (same
power source). However, to improve the noise immunity, it is better to have two decou-
pling networks close to power pins (one for V
CCA
/V
SSA
pair and one for V
CC
/V
SS
pair).
Power-up
Steady State Condition
Vcc
t
Reset
VPFDP
VPFDM
tG
Vcc
tR
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