t6020m ATMEL Corporation, t6020m Datasheet - Page 12

• Manufacturer Part Number: t6020m
• Description: Low-current Microcontroller For Watchdog Function
• Manufacturer: ATMEL Corporation

2.3.1
The T6020M 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
T6020M
12 (54)
Power-on Reset and Brown-out
Detection
BOT = 1, low brown-out voltage threshold. (3.0 V) is reset value.
BOT = 0, high brown-out voltage threshold (4.0 V).
Reset
Reset
CPU
CPU
4.0 V
3.0 V
V
NRST
DD
V DD
BOT = ’1’
BOT = ’0’
Pull-up
t d = 1.5 ms (typically)
Figure 10. Brown-out detection
t
Figure 9. Reset configuration
d
t d
CL
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.
res
CL=SYSCL/4
Brown–out
supervisor
Ext. clock
Power–on
detection
Watch–
dog
Reset
timer
reset
res
Internal
V DD
V SS
V DD
V SS
CWD
ExIn
reset
t d
t
13752
Rev. A3, 02-Apr-01
14201