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VOUT
Phase
Compensation
Vref with
Soft Stant,
CE
PWM/PFM
Selector
PWM
Comparator
Pch
Driver
Tr.
Nch
SW
Tr.
Logic
Buffer
Driver
Current
Limit & Feedback
Ramp Wave
Generator
OSC
CE/MODE
Control Logic
Error Amp.
U.V.L.O
U.V.L.O Comp.
VIN
LX
CE/MODE
VSS
1
2
3
VIN
VSS
CE
5
4
LX
VOUT
J47868-001(IC6):DC-DC Converter
PORTA
RA0/AN0
RA1/AN1
RA2/AN2/VREF-/CVREF
RA3/AN3/VREF+
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
RB0/INT
RB1
RB2
RB3/PGM
RB4
RB5
RB6/PGC
RB7/PGD
PORTB
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
RC7/RX/DT
PORTC
V
SS
V
DD,
MCLR
Program Counter
13
Data Bus
RAM
File
Registers
FLASH
Program
Memory
14
8-Level Stack
(13-bit)
Program
Bus
Instruction reg
RAM Addr
Direct Addr
7
9
8
Indirect
Addr
3
8
8
8
Addr MUX
FSR reg
STATUS reg
MUX
ALU
W reg
OSC1/CLKI
OSC2/CLKO
Power-up
Timer
Oscillator
Start-up Timer
Power-on
Reset
Wafchdog
Timer
Brown-out
In-Circuit
Debugger
Low-Voltage
Programming
Reset
Instruction
Decode &
Control
Timing
Generation
Timer0
Timer1
Timer2
10-bit A/D
USART
Synchronous
Serial Port
Voltage
Reference
Comparator
CCP1,2
Data EEPROM
Device
PIC16F876A
Program Flash
8K words
Data Memory
368 Bytes
Data EEPROM
256 Bytes
PIC16F876A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
MCLR/Vpp
RA0/AN0
RA1/AN1
RA2/AN2/Vref-/CVref
RA3/AN3/Vref+
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
Vss
OSC1/CLKI
OSC2/CLKO
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RB7/PGD
RB6/PGC
RB5
RB4
RB3/PGM
RB2
RB1
RB0/INT
Vdd
Vss
RC7/RX/DT
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA
J47870-001(IC8):Flash microcontroller
2-9
2-10