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T48C893 датащи(PDF) 14 Page - ATMEL Corporation

номер детали T48C893
подробное описание детали  The multiple times programmable (MTP) version for the MARC4 ROM types
PDF  82 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T48C893 датащи(HTML) 14 Page - ATMEL Corporation

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T48C893
Rev. A4, 22-Jan-02
14 (82)
Reset
timer
V
DD
CL
Power–on
reset
Internal
reset
res
CL=SYSCL/4
V
DD
V
SS
Brown–out
detection
V
DD
V
SS
Watch–
dog
CWD
res
Ext. clock
supervisor
ExIn
Pull-up
NRST
13752
Figure 9. Reset configuration
3.3.1
Power-on Reset and Brown-out
Detection
The T48C893 has a fully integrated power-on reset and
brown-out detection circuitry. For reset generation no ex-
ternal components are needed .
These circuits ensure that the core is held in the reset state
until the minimum operating supply voltage has been
reached. A reset condition will also be generated should
the supply voltage drop momentarily below the minimum
operating level except when a power down mode is
activated (the core is in SLEEP mode and the peripheral
clock is stopped). In this power-down mode the brown-
out detection is disabled.
Two values for the brown-out voltage threshold are
programmable via the BOT-bit in the SC-register.
V
DD
CPU
Reset
t
BOT = ’1’
2.0 V
1.7 V
CPU
Reset
BOT = ’0’
t
d
t
d
t
d
= 1.5 ms (typically)
t
d
13753
BOT = 1, low brown-out voltage threshold. (1.7 V) is reset value.
BOT = 0, high brown-out voltage threshold (2.0 V).
Figure 10. Brown-out detection



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