PIC18F-LF1XK50 Datasheet, PDF (303/420 Pages) Microchip Technology – 20-Pin USB Flash Microcontrollers

PIC18F/LF1XK50
24.2.1 CONTROL REGISTER
Register 24-15 shows the WDTCON register. This is a
readable and writable register which contains a control
bit that allows software to override the WDT enable
Configuration bit, but only if the Configuration bit has
disabled the WDT.
REGISTER 24-15: WDTCON: WATCHDOG TIMER CONTROL REGISTER
U-0
—
bit 7
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
U-0
R/W-0
—
SWDTEN⁽¹⁾
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-1
bit 0
Unimplemented: Read as ‘0’
SWDTEN: Software Enable or Disable the Watchdog Timer bit⁽¹⁾
1 = WDT is turned on
0 = WDT is turned off (Reset value)
Note 1: This bit has no effect if the Configuration bit, WDTEN, is enabled.
TABLE 24-2: SUMMARY OF WATCHDOG TIMER REGISTERS
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on page
RCON
IPEN SBOREN —
RI
TO
PD
POR
BOR
278
WDTCON
—
—
—
—
—
—
— SWDTEN 286
CONFIG2H
WDTPS3 WDTPS2 WDTPS1 WDTPS0 WDTEN 296
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Watchdog Timer.
24.3 Program Verification and
Code Protection
The overall structure of the code protection on the
PIC18 Flash devices differs significantly from other
PIC^® microcontroller devices.
The user program memory is divided into five blocks.
One of these is a boot block of 0.5K or 2K bytes,
depending on the device. The remainder of the mem-
ory is divided into individual blocks on binary boundar-
ies.
Each of the five blocks has three code protection bits
associated with them. They are:
• Code-Protect bit (CPn)
• Write-Protect bit (WRTn)
• External Block Table Read bit (EBTRn)
Figure 24-2 shows the program memory organization
for 8, 16 and 32-Kbyte devices and the specific code
protection bit associated with each block. The actual
locations of the bits are summarized in Table 24-3.
 2010 Microchip Technology Inc.
Preliminary
DS41350E-page 303