PIC18F4431-E/ML Microchip Technology, PIC18F4431-E/ML Datasheet - Page 61

• Manufacturer Part Number: PIC18F4431-E/ML
• Description: IC MCU FLASH 8KX16 44QFN
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.0
There are three memory types in enhanced MCU
devices. These memory types are:
• Program Memory
• Data RAM
• Data EEPROM
As Harvard architecture devices, the data and program
memories use separate buses, enabling concurrent
access of the two memory spaces. The data EEPROM,
for practical purposes, can be regarded as a peripheral
device, since it is addressed and accessed through a
set of control registers.
Additional detailed information on the operation of the
Flash program memory is provided in
“Flash Program
discussed separately in
Memory”.
FIGURE 6-1:
 2010 Microchip Technology Inc.
CALL,RCALL,RETURN
RETFIE,RETLW
MEMORY ORGANIZATION
High-Priority Interrupt Vector LSb
Low-Priority Interrupt Vector LSb
Reset Vector LSb
Program Memory
Stack Level 31
On-Chip Flash
Memory”. Data EEPROM is
Stack Level 1
PC<20:0>
PROGRAM MEMORY MAP
AND STACK FOR
PIC18F2331/4331
Read ‘0’s
Unused
Section 7.0 “Data EEPROM



21
000000h
000008h
000018h
001FFFh
002000h
1FFFFFh
Section 8.0
PIC18F2331/2431/4331/4431
6.1
PIC18 microcontrollers implement a 21-bit program
counter that can address a 2-Mbyte program memory
space. Accessing a location between the upper bound-
ary of the physically implemented memory and the
2-Mbyte address will return all ‘0’s (a NOP instruction).
The PIC18F2331/4331 devices each have 8 Kbytes of
Flash memory and can store up to 4,096 single-word
instructions.
The PIC18F2431/4431 devices each have 16 Kbytes
of Flash memory and can store up to 8,192 single-word
instructions.
PIC18 devices have two interrupt vectors. The Reset
vector address is at 000000h and the interrupt vector
addresses are at 000008h and 000018h.
The program memory maps for PIC18F2331/4331 and
PIC18F2431/4431 devices are shown in
and
FIGURE 6-2:
CALL,RCALL,RETURN
RETFIE,RETLW
Figure
Program Memory Organization
6-2, respectively.
High-Priority Interrupt Vector LSb
Low-Priority Interrupt Vector LSb
Reset Vector LSb
Program Memory
Stack Level 31
On-Chip Flash
Stack Level 1
PROGRAM MEMORY MAP
AND STACK FOR
PIC18F2431/4431
PC<20:0>
Read ‘0’s
Unused



21
DS39616D-page 61
000000h
000008h
000018h
003FFFh
004000h
1FFFFFh
Figure 6-1