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| PIC18F25K20T-ISS Datasheet, PDF (15/456 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology | |||
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PIC18F2XK20/4XK20
FIGURE 1-2:
PIC18F4XK20 (40/44-PIN) BLOCK DIAGRAM
Table Pointer<21>
Data Bus<8>
inc/dec logic
88
21
PCLATU PCLATH
20
PCU PCH PCL
Program Counter
Address Latch
Program Memory
(8/16/32/64 Kbytes)
Data Latch
31-Level Stack
STKPTR
Data Latch
Data Memory
Address Latch
12
Data Address<12>
4
BSR
12
FSR0
FSR1
FSR2
4
Access
Bank
12
8
Table Latch
inc/dec
logic
ROM Latch
Instruction Bus <16>
IR
Address
Decode
OSC1(3)
OSC2(3)
T1OSI
T1OSO
MCLR(2)
VDD, VSS
Instruction
Decode and
Control
State machine
control signals
8
PRODH PRODL
Internal
Oscillator
Block
LFINTOSC
Oscillator
16 MHz
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
3
BITOP
8
8 x 8 Multiply
8
W
8
8
8
8
ALU<8>
8
Precision
Band Gap
FVR
Reference
BOR
HLVD
Data
EEPROM
Timer0
Timer1
Timer2
Timer3
PORTA
PORTB
PORTC
PORTD
PORTE
RA0/AN0
RA1/AN1
RA2/AN2/VREF-/CVREF
RA3/AN3/VREF+
RA4/T0CKI/C1OUT
RA5/AN4/SS/HLVDIN/C2OUT
OSC2/CLKOUT(3)/RA6
OSC1/CLKIN(3)/RA7
RB0/INT0/FLT0/AN12
RB1/INT1/AN10/C12IN3-
RB2/INT2/AN8
RB3/AN9/CCP2(1)/C12IN2-
RB4/KBI0/AN11
RB5/KBI1/PGM
RB6/KBI2/PGC
RB7/KBI3/PGD
RC0/T1OSO/T13CKI
RC1/T1OSI/CCP2(1)
RC2/CCP1/P1A
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
RC7/RX/DT
RD0/PSP0
RD1/PSP1
RD2/PSP2
RD3/PSP3
RD4/PSP4
RD5/PSP5/P1B
RD6/PSP6/P1C
RD7/PSP7/P1D
RE0/RD/AN5
RE1/WR/AN6
RE2/CS/AN7
MCLR/VPP/RE3(2)
FVR
CVREF Comparator
ECCP1
CCP2
MSSP
EUSART
ADC
10-bit
FVR
PSP
Note 1:
2:
3:
CCP2 is multiplexed with RC1 when Configuration bit CCP2MX is set, or RB3 when CCP2MX is not set.
RE3 is only available when MCLR functionality is disabled.
OSC1/CLKIN and OSC2/CLKOUT are only available in select oscillator modes and when these pins are not being used as digital I/O.
Refer to Section 2.0 âOscillator Module (With Fail-Safe Clock Monitor)â for additional information.
ï£ 2010 Microchip Technology Inc.
DS41303G-page 15
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