UPD4991ACX Renesas Electronics America, UPD4991ACX Datasheet - Page 46

• Manufacturer Part Number: UPD4991ACX
• Manufacturer: Renesas Electronics America

Specifications of UPD4991ACX

• Lead Free Status / RoHS Status: Supplier Unconfirmed

3.2 Setting Alarm Time
changed.
44
The alarm register can be rewritten at any time because it is independent of the time counter.
Figure 3-7 shows the procedure for rewriting the alarm register.
The alarm coincidence signal does not have to be selected every time unless the alarm coincidence signal is
ALARM SET &
TP1 CONT. MODE
TP1 output control
coincidence signal
TP1 output control
writing routine
Select alarm
Alarm time
Select
Start
End
CHAPTER 3 ACCESS PROCEDURE
Figure 3-7. Setting Alarm Time
Address 0F
Address 0E
Writing address 0B
Writing addresses 0
Address 0E
H
H
H
1
5
0
H
H
H
H
H
TP1 DISABLE
ALARM FLAG RESET
ALARM DISABLE
TP1 ENABLE
ALARM ENABLE
through 0A
H