MC68HC68 MOTOROLA [Motorola, Inc], MC68HC68 Datasheet - Page 21

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

MOTOROLA
AC LINE
NOTES:
1. See Figure 12 for 32.768 kHz operation. This configuration, where the MC68HC68T1 supplies the MCU clock,
2. If an MC68HC11 MCU is used, delete the capacitor at the RESET pin.
usually requires a 1 to 4 MHz crystal.
R CHARGE
REGULATOR
BRIDGE/
Figure 20. Rechargeable Battery–Backup System
NOTE 1
0.1
m
11
F
13
14
15
POR
V BATT
XTAL
LINE
10
100 k
MC68HC68T1
8
V SS
V DD
16
CLKOUT
CPUR
V SYS
PSE
INT
SPI
SS
12
9
2
3
1
7
V DD
NC
NOTE 2
3
39
28
2
1
RESET
IRQ
OSC 1
PORT
SPI
MC68HC05C4
40
20
V DD
V SS
(EPS)
ENABLED
POWER
SUPPLY
MC68HC68T1
21