M I K R O E L E K T R O N I K A S O F T W A R E A N D H A R D W A R E S O L U T I O N S F O R T H E E M B E D D E D W O R L D
dsPICPRO
USB
3
dsPICPRO3 User
’
s Manual
MikroElektronika
Development tools
3
32
2
page
RR
EE
AA
LL
TT
IIMM
EE
CC
LL
OO
CC
KK
REAL TIME CLOCK
Real-Time Clock (RTC) is an integrated circuit chip that keeps track of the current time even
when microcontroller is turned off. Real-time clock runs on a special battery that is not con-
nected to the normal power supply.
Switch groups SW2 and SW4 are used to enable Real-Time Clock. Switch 5 on SW2, and
switches 7 and 8 on SW4 must be turned on in order to connect Real-Time Clock to micro-
controller pins.
OSCI
OSCO
A0
GND
VDD
INT
SCL
SDA
PCF8583P
R22
10K
R21
10K
R20
10K
X1
32,768 KHz
C10
22 pF
D7
BA
T43
D6
BAT43
R19
56
C4
100 nF
BA
T1
3V/230mA
VCC
VCC
X1
10MHz
C1
22pF
C2
22pF
VCC
RG15
RC1
RC2
RC3
RC4
RG6
RG7
RG8
MCLR
RG9
Vss
Vdd
RA12
RA13
RB5
RB4
RB3
RB2
RB1
RB0
RC14
RC13
RD0
RD11
RD10
RD9
RD8
RA15
Vss
OSC2
OSC1/CLKI
Vdd
RG2
RG3
RF6
RF7
RF8
RF2
RF3
RB6 RB7
RA9
RA10 AV
d
d
AV
ss
RB8
RB9
RB1
1
Vss
Vdd RB12
RB13
RB14
RB15
RD14
RD15
RF4
RF5
RG13 RG12
RG14
RA7 RA6
RG0
RG1
RF1
Vdd
Vss
RD7 RD6
RD5
RD4
RD13
RD12
RD3
RD2
RD1
dsPIC30FXXXX
RF0
RB10
RA14
1
ON
4
3
2
58
7
6
SW4
RG8
RF4
RF5
RC13
RG7
RG6
RG2
RG3
MOSI
RX485
TX485
RT485
MISO
SCK
SCL
SDA
1
ON
4
3
2
58
7
6
RF6
RA12
RG9
SW2
RA15
RA14
DQ
GLCD BCK
LCD BCK
LED RGH
RTC INT
MMC CS
ETH WOL
ETH INT
VCC
Figure 38.
Real-Time Clock
Figure 39.
Real-Time Clock schematic
