MC68HC68T1 Datasheet, PDF (12/26 Pages) Motorola, Inc – Real-Time Clock plus RAM with Serial Interface

INT
POWER–UP
INTERNAL
INTERRUPT
SIGNAL
PSE
ALARM
CIRCUIT
PERIODIC
INTERRUPT
SIGNAL
CPUR
CLKOUT
POWER
SENSE
CIRCUIT
SERIAL
INTERFACE
MISO
MOSI
REAL–TIME CLOCK
MC68HC68T1
NOTE: The VSYS pin must be powered up.
Figure 10. Power–Up Functional Diagram (Initiated by Internal Interrupt Signal Generation)
VBATT
VDD
BACKUP
SWITCH
POWER SWITCH/
MODE CONTROL
PSE
CPUR
CLKOUT
SERIAL
INTERFACE
VSYS
MISO
MOSI
VBATT
REAL–TIME CLOCK
MC68HC68T1
Figure 11. Power–Up Functional Diagram (Initiated by a Rise in Voltage on the VSYS Pin)
MC68HC68T1
12
MOTOROLA