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T89C5115-RATIM bảng dữ liệu(PDF) 19 Page - ATMEL Corporation

tên linh kiện T89C5115-RATIM
Giải thích chi tiết về linh kiện  Low Pin Countl 8-bit Microcontroller with A/D Converter and 16 KBytes Flash Memory
PDF  113 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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AT89C5115
4128F–8051–05/06
Table 13. Minimum Reset Capacitor for a 15k Pull-down Resistor
Note:
These values assume VDD starts from 0v to the nominal value. If the time between two
on/off sequences is too fast, the power-supply decoupling capacitors may not be fully
discharged, leading to a bad reset sequence.
During a Normal
Operation (Warm Reset)
Reset pin must be maintained for at least 2 machine cycles (24 oscillator clock periods)
to apply a reset sequence during normal operation. The number of clock periods is
mode independent (X2 or X1).
Watchdog Reset
A 1K resistor must be added in series with the capacitor to allow the use of watchdog
reset pulse output on the RST pin or when an external power-supply supervisor is used.
Figure 6 shows the reset circuitry when a capacitor is used.
Figure 6. Reset Circuitry for a Watchdog Configuration
Figure 7 shows the reset circuitry when an external reset circuit is used.
Figure 7. Reset Circuitry Example Using an External Reset Circuit
oscrst/vddrst
1ms
10ms
100ms
5ms
2.7µF
4.7µF
47µF
20ms
10µF
15µF
47µF
VDD
Rrst
Crst
1k
RST pin
Internal reset
watchdog
To other on-board circuitry
Reset input circuitry
VDD
Rrst
1k
RST pin
Internal reset
watchdog
To other on-board circuitry
Reset input circuitry
RST
External reset
circuit



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