MC68HC68T1 Datasheet, PDF (21/26 Pages) Motorola, Inc – Real-Time Clock plus RAM with Serial Interface

AC LINE
BRIDGE/
REGULATOR
NC
RCHARGE
100 kΩ
0.1 mF
13
10
POR
VBATT
16
VDD
12
VSYS
(EPS)
ENABLED
POWER
SUPPLY
40
VDD
NOTE 1
PSE ⁹
14
MC68HC68T1
XTAL
15
CPUR ²
VDD _{NOTE 2}
MC68HC05C4
1 _RESET
11 _LINE
INT ³
1
CLKOUT
SS ⁷
VSS
SPI
8
2
39
IRQ
OSC 1
28 _PORT
3
SPI _VSS
20
NOTES:
1. See Figure 12 for 32.768 kHz operation. This configuration, where the MC68HC68T1 supplies the MCU clock,
usually requires a 1 to 4 MHz crystal.
2. If an MC68HC11 MCU is used, delete the capacitor at the RESET pin.
Figure 20. Rechargeable Battery–Backup System
MOTOROLA
MC68HC68T1
21