AT89LP216-20PI datasheet(13/90 Pages) ATMEL

13 / 90 page

3621A–MICRO–6/06

AT89LP216 [Preliminary]

Figure 10-1. 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

CC reaches the BOD threshold voltage VBOD as shown in Figure 10-2. 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 10-2. Power-on Reset Sequence (BOD Enabled)

Note:

tPOR is approximately 92 µs ± 5%.

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

the clock source (Table 10-1). The start-up delay should be selected to provide enough settling

time for V

CC and the selected clock source. 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.

VCC

RST

Time-out

POR + tSUT

RHD

POR

Internal

Reset

RST

Internal

Reset

(RST Tied to V

CC)

(RST Controlled Externally)

POR

VCC

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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