PIC16C505-04I/P Microchip Technology Inc., PIC16C505-04I/P Datasheet - Page 35

• Manufacturer Part Number: PIC16C505-04I/P
• Description: 14 PIN, 1.5 KB OTP, 72 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16C505-04I/P

• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 11
• Memory Type: OTP
• Number Of Bits: 8
• Package Type: 14-pin PDIP
• Programmable Memory: 1.5K Bytes
• Ram Size: 72 Bytes
• Speed: 4 MHz
• Timers: 1- 8-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

7.6.1
The WDT has a nominal time-out period of 18 ms,
(with no prescaler). If a longer time-out period is
desired, a prescaler with a division ratio of up to 1:128
can be assigned to the WDT (under software control)
by writing to the OPTION register. Thus, a time-out
period of a nominal 2.3 seconds can be realized.
These periods vary with temperature, V
part process variations (see DC specs).
Under worst case conditions (V
= Max., max. WDT prescaler), it may take several
seconds before a WDT time-out occurs.
FIGURE 7-11: WATCHDOG TIMER BLOCK DIAGRAM
TABLE 7-6:
N/A
Legend: Shaded boxes = Not used by Watchdog Timer, — = unimplemented, read as '0', u = unchanged.
Address
1999 Microchip Technology Inc.
WDT PERIOD
OPTION
Name
Note: T0CS, T0SE, PSA, PS<2:0>
SUMMARY OF REGISTERS ASSOCIATED WITH THE WATCHDOG TIMER
Configuration Bit
WDT Enable
Watchdog
are bits in the OPTION register.
Timer
RBWU
Bit 7
From Timer0 Clock Source
(Figure 6-5)
DD
= Min., Temperature
RBPU
Bit 6
DD
and part-to-
T0CS
1
0
Bit 5
PSA
M
U
X
T0SE
Bit 4
Bit 3
PSA
0
7.6.2
The CLRWDT instruction clears the WDT and the
postscaler, if assigned to the WDT, and prevents it
from timing out and generating a device RESET.
The SLEEP instruction resets the WDT and the
postscaler, if assigned to the WDT. This gives the
maximum SLEEP time before a WDT wake-up reset.
Time-out
8 - to - 1 MUX
WDT
MUX
Postscaler
Postscaler
Bit 2
PS2
1
WDT PROGRAMMING CONSIDERATIONS
Bit 1
PS1
PSA
To Timer0 (Figure 6-4)
Bit 0
PS0
PS<2:0>
PIC16C505
1111 1111
Power-On
Value on
Reset
DS40192C-page 35
1111 1111
All Other
Value on
Resets