PIC17C75X
In Figure 5-5, Figure 5-6 and Figure 5-7, T
PWRT
>
T
OST
, as would be the case in higher frequency crys-
tals. For lower frequency crystals, (i.e., 32 kHz) T
OST
would be greater.
FIGURE 5-5:
TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO V
DD
)
V
DD
MCLR
INTERNAL POR
T
PWRT
PWRT TIME-OUT
T
OST
OST TIME-OUT
INTERNAL RESET
FIGURE 5-6:
TIME-OUT SEQUENCE ON POWER-UP (MCLR NOT TIED TO V
DD
)
V
DD
MCLR
INTERNAL POR
T
PWRT
PWRT TIME-OUT
T
OST
OST TIME-OUT
INTERNAL RESET
FIGURE 5-7:
SLOW RISE TIME (MCLR TIED TO V
DD
)
Minimum V
DD
operating voltage
5V
V
DD
MCLR
0V
1V
INTERNAL POR
T
PWRT
PWRT TIME-OUT
T
OST
OST TIME-OUT
INTERNAL RESET
DS30264A-page 24
Preliminary
漏
1997 Microchip Technology Inc.