PIC17C44 Datasheet, PDF (104/241 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PIC17C4X
FIGURE 14-8: WATCHDOG TIMER BLOCK DIAGRAM
On-chip RC
Oscillator⁽¹⁾
WDT
Postscaler
WDT Enable
4 - to - 1 MUX
WDTPS1:WDTPS0
Note 1: This oscillator is separate from the external
RC oscillator on the OSC1 pin.
WDT Overflow
TABLE 14-4: REGISTERS/BITS ASSOCIATED WITH THE WATCHDOG TIMER
Address
Name
Bit 7 Bit 6 Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
Power-on
Reset
Value on all
other resets
(Note1)
—
Config
—
PM1
—
PM0 WDTPS1 WDTPS0 FOSC1 FOSC0 (Note 2)
(Note 2)
06h, Unbanked CPUSTA
—
—
STKAV GLINTD
TO
PD
—
—
--11 11--
Legend: - = unimplemented read as '0', q - value depends on condition, shaded cells are not used by the WDT.
Note 1: Other (non power-up) resets include: external reset through MCLR and Watchdog Timer Reset.
2: This value will be as the device was programmed, or if unprogrammed, will read as all '1's.
--11 qq--
DS30412C-page 104
© 1996 Microchip Technology Inc.