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參數(shù)資料
| 型號： | UPD78363A |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 16/8-BIT單晶片微控制器 |
| 文件頁數(shù)： | 56/96頁 |
| 文件大?。?/td> | 502K |
| 代理商： | UPD78363A |
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μ
PD78363A, 78365A, 78366A, 78368A
56
7.
RESET FUNCTION
When a low level is input to the RESET pin, the system is reset, and each hardware enters the initial status
(reset status). When the RESET pin goes high, the reset status is released, and program execution is started.
Initialize the contents of each register through program as necessary.
Especially, change the number of cycles of the programmable wait control register as necessary.
The RESET pin is equipped with a noise rejecter circuit of analog delay to prevent malfunctioning due to noise.
Cautions 1. While the RESET pin is active (low level), all the pins go into a high-impedance state
(except WDTO, AV
REF
, AV
DD
, AV
SS
, V
DD
, V
SS
, X1, and X2 pins).
2. When an external RAM is connected, do not connect a pull-up resistor to the P90/RD and
P91/WR pins, because the P90/RD and P91/WR pins may go into a high-impedance state,
resulting in destruction of the contents of the external RAM. In addition, signal contention
occurs on the address/data bus, resulting in damage to the input/output circuit.
Figure 7-1. Accepting Reset Signal
RESET input
Analog
delay
Analog
delay
Analog
delay
Rejected
as noise
Reset
accepted
Reset
released
To effect reset on when power is applied, make sure that sufficient time elapses to stabilize the oscillation
after the power is applied until the reset signal is accepted, as shown in Figure 7-2.
Figure 7-2. Reset on Power Application
V
DD
RESET
Oscillation
stabilization
time
Analog
delay
Reset
released
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPD78365A | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD78366A | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD78366AGF | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD78368A | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
| UPD78368AGF | 16/8-BIT SINGLE-CHIP MICROCONTROLLERS |
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