Rainbow-electronics ATmega163L Bedienungsanleitung PDF herunterladen (Seite 22)

ATmega163(L)

Figure 24. Reset Logic

Notes: 1. Values are guidelines only. Actual values are TBD.

2. The Power-on Reset will not work unless the supply voltage has been below V

POT

(falling).

MCU Status

Brown-Out

Reset Circuit

BODEN

BODLEVEL

Delay Counters

CKSEL[3:0]

TIMEOUT

WDRF

BORF

EXTRF

PORF

DATA B U S

Clock

Generator

SPIKE

FILTER

100-500kΩ

Table 4. Reset Characteristics (V

= 5.0V)

(1)

Symbol Parameter Condition Min Typ Max Units

POT

Power-on Reset Threshold Voltage (rising) 1.0 1.4 1.8 V

Power-on Reset Threshold Voltage (falling)

(2)

0.4 0.6 0.8 V

RST

RESET Pin Threshold Voltage - - 0.85 V

BOT

Brown-out Reset Threshold Voltage (BODLEVEL = 1) 2.5 2.7 2.9

(BODLEVEL = 0) 3.6 4.0 4.4

Table 5. Reset Delay Selections

(1)

CKSEL

(2)

Start-up Time, V

= 2.7V,

BODLEVEL Unprogrammed

Start-up Time, V

= 4.0V,

BODLEVEL Programmed Recommended Usage

(3)

0000 4.2 ms + 6 CK 5.8 ms + 6 CK Ext. Clock, fast rising power

0001 30 µs + 6 CK

(4)

10 µs + 6 CK

(5)

Ext. Clock, BOD enabled

0010

(6)

67 ms + 6 CK 92 ms + 6 CK Int. RC Oscillator, slowly rising power

0011 4.2 ms + 6 CK 5.8 ms + 6 CK Int. RC Oscillator, fast rising power

0100 30 µs + 6 CK

(4)

10 µs + 6 CK

(5)

Int. RC Oscillator, BOD enabled

0101 67 ms + 6 CK 92 ms + 6 CK Ext. RC Oscillator, slowly rising power

0110 4.2 ms + 6 CK 5.8 ms + 6 CK Ext. RC Oscillator, fast rising power

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 155 156

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