PIC16C926-I/PT Microchip Technology, PIC16C926-I/PT Datasheet - Page 112

• Manufacturer Part Number: PIC16C926-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,64PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C926-I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: OTP
• Ram Size: 336 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 336 B
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 25
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DVA16PQ640 - ADAPTER DEVICE FOR MPLAB-ICEAC164023 - MODULE SKT PROMATEII 68TQFP
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC16C926I/PT

PIC16C925/926
12.7
The Watchdog Timer is a free running on-chip RC oscil-
lator, which does not require any external components.
This RC oscillator is separate from the RC oscillator of
the OSC1/CLKIN pin. That means that the WDT will
run, even if the clock on the OSC1/CLKIN and
OSC2/CLKOUT pins of the device has been stopped,
for example, by execution of a SLEEP instruction. Dur-
ing normal operation, a WDT time-out generates a
device RESET (Watchdog Timer Reset). If the device is
in SLEEP mode, a WDT time-out causes the device to
wake-up and continue with normal operation (Watch-
dog Timer Wake-up). The WDT can be permanently
disabled
(Section 12.1).
12.7.1
The WDT has a nominal time-out period of 18 ms (with
no prescaler). The time-out periods vary with tempera-
ture, V
DC specs). If longer time-out periods are desired, a
prescaler with a division ratio of up to 1:128 can be
FIGURE 12-12:
FIGURE 12-13:
DS39544A-page 110
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 12-1 for operation of these bits.
81h, 181h
Note: PSA and PS2:PS0 are bits in the OPTION register.
Address
2007h
DD
Watchdog Timer (WDT)
and process variations from part to part (see
by
WDT PERIOD
Config. bits
clearing
OPTION
Name
WATCHDOG TIMER BLOCK DIAGRAM
SUMMARY OF WATCHDOG TIMER REGISTERS
WDT Timer
Enable bit
WDT
configuration
RBPU
Bit 7
From TMR0 Clock Source
(Figure 5-6)
(1)
BOREN
INTEDG
bit
Bit 6
0
1
WDTE
(1)
PSA
M
U
X
Preliminary
T0CS
Bit 5
CP1
assigned to the WDT under software control, by writing
to the OPTION register. Thus, time-out periods up to
2.3 seconds can be realized.
The CLRWDT and SLEEP instructions clear the WDT
and the postscaler, if assigned to the WDT, prevent it
from timing out and generating a device RESET
condition.
The TO bit in the STATUS register will be cleared upon
a Watchdog Timer time-out.
12.7.2
It should also be taken into account that under worst
case conditions (V
Max. WDT prescaler) it may take several seconds
before a WDT time-out occurs.
0
T0SE
Bit 4
Note:
CP0
Time-out
8 - to - 1 MUX
MUX
WDT
Postscaler
PWRTE
When a CLRWDT instruction is executed
and the prescaler is assigned to the WDT,
the prescaler count will be cleared, but the
prescaler assignment is not changed.
1
WDT PROGRAMMING
CONSIDERATIONS
8
Bit 3
PSA
DD
(1)
PSA
To TMR0 (Figure 5-6)
= Min., Temperature = Max., and
WDTE
Bit 2
PS2
2001 Microchip Technology Inc.
PS2:PS0
FOSC1
Bit 1
PS1
FOSC0
Bit 0
PS0