PIC18F4431-I/P Microchip Technology Inc., PIC18F4431-I/P Datasheet - Page 285
![no-image](/images/manufacturer_photos/0/4/440/microchip_technology_inc__sml.jpg)
PIC18F4431-I/P
Manufacturer Part Number
PIC18F4431-I/P
Description
Microcontroller; 16 KB Flash; 768 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F4431-IP.pdf
(396 pages)
Specifications of PIC18F4431-I/P
A/d Inputs
9-Channel, 10-Bit
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
16K Bytes
Ram Size
768 Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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22.5
The overall structure of the code protection on the
PIC18 Flash devices differs significantly from other
PICmicro
The user program memory is divided into five blocks.
One of these is a boot block of 512 bytes. The
remainder of the memory is divided into four blocks on
binary boundaries.
FIGURE 22-5:
TABLE 22-3:
2003 Microchip Technology Inc.
300008h
300009h
30000Ah
30000Bh
30000Ch
30000Dh
Legend:
Unimplemented
File Name
(PIC18FX331)
Program Verification and
Code Protection
®
Boot Block
devices.
8 Kbytes
Read 0’s
Shaded cells are unimplemented.
Block 0
Block 1
CONFIG5L
CONFIG5H
CONFIG6L
CONFIG6H
CONFIG7L
CONFIG7H
SUMMARY OF CODE PROTECTION REGISTERS
CODE-PROTECTED PROGRAM MEMORY FOR PIC18F2331/2431/4331/4431
WRTD
0000h
0FFFh
0200h
0FFFh
1000h
1FFFh
3FFFh
Bit 7
CPD
Address
—
—
—
—
Range
EBTRB
WRTB
Bit 6
CPB
—
—
—
PIC18F2331/2431/4331/4431
(PIC18FX431)
MEMORY SIZE/DEVICE
Boot Block
16 Kbytes
Block 0
Block 1
Block 2
Block 3
Preliminary
WRTC
Bit 5
—
—
—
—
—
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 22-5 shows the program memory organization
for 8- and 16-Kbyte devices, and the specific code
protection bit associated with each block. The actual
locations of the bits are summarized in Table 22-3.
Bit 4
—
—
—
—
—
—
0000h
01FFh
0200h
0FFFh
1000h
1FFFh
2000h
2FFFh
3000h
3FFFh
Address
Range
EBTR3
WRT3
Bit 3
CP3
—
—
—
Block Code Protection
EBTR2
WRT2
Bit 2
CPB, WRTB, EBTRB
CP2
CP0, WRT0, EBTR0
CP1, WRT1, EBTR1
CP2, WRT2, EBTR2
CP3, WRT3, EBTR3
—
—
—
Controlled By:
EBTR1
WRT1
Bit 1
CP1
DS39616B-page 283
—
—
—
EBTR0
WRT0
Bit 0
CP0
—
—
—
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