MC68HC68T1 Datasheet, PDF (19/26 Pages) Motorola, Inc – Real-Time Clock plus RAM with Serial Interface

APPLICATION CIRCUITS
LOW VOLTAGE
AC LINE
BRIDGE/
REGULATOR
16
VDD
100 kΩ
NOTE 2
10
POR
0.1 mF
40
VDD
NOTE 1
11 _LINE
INT ³
VSYS ¹²
MC68HC68T1
13 _VBATT
CPUR ²
2
39
IRQ
VDD
MC68HC05C4 ³⁸
NOTE 3
1
RESET
SS ⁷
SCK ⁴
MOSI ⁵
MISO ⁶
XTALin
14
34 _PORT
33 _SCK
32 _MOSI
31 _MISO
NOTES:
1. Clock circuit driven by line input frequency.
2. Power–on reset circuit included to detect power failure.
3. If an MC68HC11 MCU is used, delete the capacitor at the RESET pin.
Figure 18. Power–Always–On System
MOTOROLA
MC68HC68T1
19