PIC17C7XX Datasheet, PDF (24/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
In Figure 5-5, Figure 5-6 and Figure 5-7, the TPWRT
timer timeout is greater then the TOST timer timeout, as
would be the case in higher frequency crystals. For
lower frequency crystals, (i.e., 32 kHz) TOST may be
greater.
FIGURE 5-5: TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO VDD)
VDD
MCLR
INTERNAL POR
PWRT TIME-OUT
OST TIME-OUT
TPWRT
TOST
INTERNAL RESET
FIGURE 5-6: TIME-OUT SEQUENCE ON POWER-UP (MCLR NOT TIED TO VDD)
VDD
MCLR
INTERNAL POR
PWRT TIME-OUT
OST TIME-OUT
TPWRT
TOST
INTERNAL RESET
FIGURE 5-7:
SLOW RISE TIME (MCLR TIED TO VDD)
Minimum VDD operating voltage
5V
VDD
0V
1V
MCLR
INTERNAL POR
TPWRT
PWRT TIME-OUT
TOST
OST TIME-OUT
INTERNAL RESET
DS30289A-page 24
© 1998 Microchip Technology Inc.