PIC18F2450_08 Datasheet, PDF (12/324 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2450/4450
FIGURE 1-1:
PIC18F2450 (28-PIN) BLOCK DIAGRAM
Table Pointer<21>
Data Bus<8>
inc/dec logic
21
20
88
PCLATU PCLATH
PCU PCH PCL
Program Counter
Address Latch
Program Memory
(24/32 Kbytes)
Data Latch
31 Level Stack
STKPTR
Data Latch
Data Memory
(2 Kbytes)
Address Latch
12
Data Address<12>
4
BSR
12
FSR0
FSR1
FSR2
4
Access
Bank
12
8
Table Latch
inc/dec
logic
PORTA
PORTB
ROM Latch
Instruction Bus <16>
IR
Address
Decode
OSC1⁽²⁾
OSC2⁽²⁾
T1OSI
T1OSO
MCLR⁽¹⁾
VDD, VSS
VUSB
Instruction
Decode &
Control
State Machine
Control Signals
8
PRODH PRODL
Internal
Oscillator
Block
INTRC
Oscillator
Single-Supply
Programming
In-Circuit
Debugger
Power-up
Timer
Oscillator
Start-up Timer
Power-on
Reset
Watchdog
Timer
Brown-out
Reset
Fail-Safe
Clock Monitor
USB Voltage
Regulator
3
BITOP
8
8 x 8 Multiply
8
W
8
8
8
8
ALU<8>
8
Band Gap
Reference
PORTC
PORTE
BOR
HLVD
Timer0
Timer1
Timer2
ADC
10-Bit
RA0/AN0
RA1/AN1
RA2/AN2/VREF-
RA3/AN3/VREF+
RA4/T0CKI/RCV
RA5/AN4/HLVDIN
OSC2/CLKO/RA6
RB0/AN12/INT0
RB1/AN10/INT1
RB2/AN8/INT2/VMO
RB3/AN9/VPO
RB4/AN11/KBI0
RB5/KBI1/PGM
RB6/KBI2/PGC
RB7/KBI3/PGD
RC0/T1OSO/T1CKI
RC1/T1OSI/UOE
RC2/CCP1
RC4/D-/VM
RC5/D+/VP
RC6/TX/CK
RC7/RX/DT
MCLR/VPP/RE3⁽¹⁾
CCP1
EUSART
USB
Note 1: RE3 is multiplexed with MCLR and is only available when the MCLR Resets are disabled.
2: OSC1/CLKI and OSC2/CLKO are only available in select oscillator modes and when these pins are not being used as digital I/O. Refer
to Section 2.0 “Oscillator Configurations” for additional information.
DS39760D-page 10
© 2008 Microchip Technology Inc.