MC68HC68 MOTOROLA [Motorola, Inc], MC68HC68 Datasheet - Page 19

• Manufacturer Part Number: MC68HC68
• Description: Real-Time Clock plus RAM with Serial Interface
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
LOW VOLTAGE
AC LINE
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.
NOTE 1
REGULATOR
BRIDGE/
11
13
LINE
V BATT
Figure 18. Power–Always–On System
16
V DD
MC68HC68T1
APPLICATION CIRCUITS
14
XTAL in
10
POR
CPUR
V SYS
MOSI
MISO
SCK
INT
100 k
SS
NOTE 2
3
12
2
7
4
5
6
NOTE 3
0.1
m
F
V DD
34
33
32
31
1
2
IRQ
RESET
PORT
SCK
MOSI
MISO
MC68HC05C4
40
V DD
39
38
MC68HC68T1
19