AT89LP6440 datasheet(33/194 Pages) ATMEL

33 / 194 page

3706A–MICRO–9/09

AT89LP6440 - Preliminary

generated reset can be extended beyond the power-on period by holding the RST pin low longer

than the time-out.

Figure 7-1.

Power-on Reset Sequence (BOD Disabled)

If the Brown-out Detector (BOD) is also enabled, the start-up timer does not begin counting until

after V

DD reaches the BOD threshold voltage VBOD as shown in Figure 7-2. However, if this event

occurs prior to the end of the initialization sequence, the timer must first wait for that sequence to

complete before counting.

Figure 7-2.

Power-on Reset Sequence (BOD Enabled)

Note:

POR is approximately 143 µs ± 5%.

The start-up timer delay is user-configurable with the Start-up Time User Fuses and depends on

the clock source (Table 7-1). The Start-Up Time fuses also control the length of the start-up time

after a Brown-out Reset or when waking up from Power-down during internally timed mode. The

start-up delay should be selected to provide enough settling time for V

DD and the selected clock

source. The device operating environment (supply voltage, frequency, temperature, etc.) must

VDD

RST

Time-out

POR + tSUT

RHD

POR

Internal

Reset

RST

Internal

Reset

(RST Tied to V

CC)

(RST Controlled Externally)

POR

VDD

RST

Time-out

POR

RHD

POR

Internal

Reset

RST

Internal

Reset

SUT

BOD

(RST Tied to V

CC)

(RST Controlled Externally)

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