UPD78F0078GK-9ET-A Renesas Electronics America, UPD78F0078GK-9ET-A Datasheet - Page 212

• Manufacturer Part Number: UPD78F0078GK-9ET-A
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0078GK-9ET-A

• Lead Free Status / Rohs Status: Supplier Unconfirmed

10.1 Watch Timer Functions
(1) Watch timer
(2) Interval timer
210
Remark f
The watch timer has the following functions.
The watch timer and the interval timer can be used simultaneously.
Figure 10-1 shows the watch timer block diagram.
When the main system clock or subsystem clock is used, interrupt requests (INTWT) are generated at 2
second or 2
Interrupt requests (INTWTI) are generated at the preset time interval.
For the interval time, refer to Table 10-2.
f
X
/2
f
XT
7
f
f
f
W
X
XT
WX
: Main system clock oscillation frequency
: Watch timer clock frequency (f
: Subsystem clock oscillation frequency
: f
5
/f
W
W
or f
second intervals.
f
W
W
/2
9
2
f
W
4
2
f
W
9-bit prescaler
5
Figure 10-1. Watch Timer Block Diagram
f
2
W
6
CHAPTER 10 WATCH TIMER
Clear
f
2
W
7
User’s Manual U14260EJ4V0UD
f
2
W
8
WTM7 WTM6 WTM5 WTM4
Watch timer operation
mode register (WTM)
X
/2
7
f
2
or f
W
Internal bus
9
XT
)
f
WX
WTM3
5-bit counter
WTM1
WTM0
Clear
INTWT
INTWTI
14
/f
W