PIC16C505-04E/P Microchip Technology, PIC16C505-04E/P Datasheet - Page 35

• Manufacturer Part Number: PIC16C505-04E/P
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,DIP,14PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C505-04E/P

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Program Memory Size: 1.5KB (1K x 12)
• Program Memory Type: OTP
• Ram Size: 72 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 14-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 309-1086 - ADAPTER 14-ZIF BD W/14-SO PLUGS309-1085 - ADAPTER 14-DIP BD W/2 14-SO PLUG
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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