PIC18F26J50-I/ML【PDF 27/32 页】IC PIC MCU FLASH 64K 2V 28-QFN

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Sheet目录3858

23页 24页 25页 26页 [27页]28页 29页 30页 31页

PIC18F2XJXX/4XJXX FAMILY

DS39687E-page 4

2009 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 microcontroller VDD pins. The

output of the regulator is supplied to the VDDCORE/VCAP

pin. On these devices, this pin simultaneously serves

as both the regulator output and the microcontroller

core power input pin. For these devices, the

VDDCORE/VCAP pin should be tied to a capacitor and

nothing else.

PIC18LFXXJXX devices do not have an internal core

voltage regulator. On these devices (“PIC18LF” in the

part number), power must be externally supplied to

both VDD and VDDCORE/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. Enabling

code protection, thus protects the entire code memory,

and not individual segments.

2.5V

VDD

VDDCORE/VCAP

VSS

2.5V

VDD

VDDCORE/VCAP

VSS

3.3V

(VDD

= VDDCORE)

(VDD

≥ VDDCORE)

PIC18F2XJXX/4XJXX Devices (Regulator Enabled)

PIC18F2XJXX/4XJXX

PIC18LF2XJXX/4XJXX Devices (Regulator Disabled)

VDD

VDDCORE/VCAP

VSS

3.3V

PIC18LF2XJXX/4XJXX

Device*

Program

Memory

(Kbytes)

Location of Flash

Configuration

Words

PIC18F24J10

3FF8h:3FFFh

PIC18F44J10

PIC18F24J11

PIC18F44J11

PIC18F24J50

PIC18F44J50

PIC18F25J10

7FF8h:7FFFh

PIC18F45J10

PIC18F25J11

PIC18F45J11

PIC18F25J50

PIC18F45J50

PIC18F26J11

FFF8h:FFFFh

PIC18F46J11

PIC18F26J13

PIC18F46J13

PIC18F26J50

PIC18F46J50

PIC18F26J53

PIC18F46J53

PIC18F27J13

128

1FFF8h:1FFFFh

PIC18F47J13

PIC18F27J53

PIC18F47J53

Includes PIC18F and PIC18LF devices.

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