PIC16F87-E/ML Microchip Technology, PIC16F87-E/ML Datasheet - Page 144

• Manufacturer Part Number: PIC16F87-E/ML
• Description: IC MCU FLASH 4KX14 EEPROM 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F87-E/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 7KB (4K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• For Use With: XLT28QFN3 - SOCKET TRAN ICE 18DIP/28QFNAC164033 - ADAPTER 28QFN TO 18DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -

PIC16F87/88
REGISTER 15-3:
TABLE 15-6:
DS30487C-page 142
81h,181h OPTION_REG
2007h
105h
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1:
Address
Configuration bits
WDTCON
See Register 15-1 for operation of these bits.
bit 7-5
bit 4-1
bit 0
Name
SUMMARY OF WATCHDOG TIMER REGISTERS
bit 7
Unimplemented: Read as ‘0’
WDTPS<3:0>: Watchdog Timer Period Select bits
0000 = 1:32
0001 = 1:64
0010 = 1:128
0011 = 1:256
0100 = 1:512
0101 = 1:1024
0110 = 1:2048
0111 = 1:4096
1000 = 1:8192
1001 = 1:16394
1010 = 1:32768
1011 = 1:65536
SWDTEN: Software Enable/Disable for Watchdog Timer bit
1 = WDT is turned on
0 = WDT is turned off
Legend:
R = Readable bit
-n = Value at POR
Value
WDTCON: WATCHDOG CONTROL REGISTER (ADDRESS 105h)
Bit
Note 1: If WDTEN configuration bit = 1, then WDT is always enabled, irrespective of this
U-0
—
Prescale
RBPU
Rate
Bit 7
LVP
control bit. If WDTEN configuration bit = 0, then it is possible to turn WDT on/off with
this control bit.
—
U-0
—
INTEDG
BOREN
Bit 6
—
U-0
—
W = Writable bit
‘1’ = Bit is set
MCLRE
T0CS
Bit 5
—
WDTPS3
R/W-0
WDTPS3 WDTPS2 WSTPS1 WDTPS0 SWDTEN
FOSC2
T0SE
Bit 4
WDTPS2 WDTPS1 WDTPS0 SWDTEN
R/W-1
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
PWRTEN
Bit 3
PSA
(1)
R/W-0
WDTEN
 2005 Microchip Technology Inc.
Bit 2
PS2
R/W-0
x = Bit is unknown
FOSC1
Bit 1
PS1
R/W-0
FOSC0
Bit 0
PS0
bit 0
(1)