
19
FN1547.8
October 29, 2007
FIGURE 18. EXAMPLE OF A SYSTEM WITH A BATTERY BACKUP
System Diagrams (Continued)
AC
LINE
REGULATOR
POR
VDD
VSYS
VBATT
PSE
CPUR
INT
CLK
XTAL
LINE
OUT
CE
SPI
VSS
20k
1k
0.047
VDD
RTC
22M
R
CHARGE
0.1
100k
VDD
3
NC
VDD
RESET
CDP68HC05C4B
IRQ
OSC1
PORT
SPI
VSS
(EPS)
ENABLED
POWER
SUPPLY
CDP68HC68T1