PIC18F2XJXX/4XJXX FAMILY
DS30009687F-page 4 2008-2015 Microchip Technology Inc.
2.1.1 PIC18F2XJXX/4XJXX/
LF2XJXX/LF4XJXX DEVICES AND
THE ON-CHIP VOLTAGE
REGULATOR
PIC18FXXJXX devices have an internal core voltage
regulator. On these devices (“PIC18F” in the part num-
ber), the regulator is always enabled. The regulator
input is taken from the V
DD pins of the microcontroller.
The output of the regulator is supplied to the V
DDCORE/
V
CAP pin. On these devices, this pin simultaneously
serves as both regulator output and microcontroller
core power input pin. For these devices, the VDDCORE/
V
CAP pin should be tied only to a capacitor.
PIC18LFXXJXX devices do not have an internal core
voltage regulator. On the low-voltage devices (LF),
power must be externally supplied to both V
DD and
V
DDCORE/VCAP.
Whether or not the regulator is used, it is always good
design practice to have sufficient capacitance on all
supply pins. Examples are shown in Figure 2-3.
The specifications for core voltage and capacitance are
listed in Section 6.0 “AC/DC Characteristics Timing
Requirements for Program/Verify Test Mode”.
FIGURE 2-3: CONNECTIONS FOR THE
ON-CHIP REGULATOR
2.2 Memory Maps
The PIC18F2XJXX/4XJXX Family of devices offers
program memory sizes of 16, 32, 64, and 128 Kbytes.
The memory sizes for different members of the family
are shown in Table 2-2. The overall memory maps for
all the devices are shown in Figure 2-4.
TABLE 2-2: PROGRAM MEMORY SIZES
FOR PIC18F2XJXX/4XJXX
FAMILY DEVICES
For purposes of code protection, the program memory
for every device is treated as a single block. Therefore,
enabling code protection, thus protecting the entire
code memory and not individual segments.
2.5V
VDD
VDDCORE/VCAP
VSS
2.5V
VDD
VDDCORE/VCAP
VSS
3.3V
(V
DD VDDCORE)
(V
DD VDDCORE)
PIC18F2XJXX/4XJXX Devices (Regulator Enabled)
PIC18F2XJXX/4XJXX
PIC18LF2XJXX/4XJXX Devices (Regulator Disabled)
V
DD
V
DDCORE
/V
CAP
V
SS
CF
3.3V
PIC18LF2XJXX/4XJXX
PIC18LF2XJXX/4XJXX
Device*
Program
Memory
(Kbytes)
Location of Flash
Configuration
Words
PIC18F24J10
16 3FF8h:3FFFh
PIC18F44J10
PIC18F24J11
PIC18F44J11
PIC18F24J50
PIC18F44J50
PIC18F25J10
32 7FF8h:7FFFh
PIC18F45J10
PIC18F25J11
PIC18F45J11
PIC18F25J50
PIC18F45J50
PIC18F26J11
64 FFF8h:FFFFh
PIC18F46J11
PIC18F26J13
PIC18F46J13
PIC18F26J50
PIC18F46J50
PIC18F26J53
PIC18F46J53
PIC18F27J13
128 1FFF8h:1FFFFh
PIC18F47J13
PIC18F27J53
PIC18F47J53
* Includes PIC18F and PIC18LF devices.
