UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 138

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

9.3 Registers Controlling Watchdog Timer
136
Symbol
The following two registers are used to control the watchdog timer.
(1)
Remarks 1. f
TCL2
Timer clock selection register 2 (TCL2)
Watchdog timer mode register (WDTM)
Timer clock selection register 2 (TCL2)
This register sets the watchdog timer count clock.
TCL2 is set using an 8-bit memory manipulation instruction.
RESET input sets TCL2 to 00H.
TCL22
Other than above
7
0
0
0
1
1
2. The parenthesized values apply to operation at f
TCL21
X
6
0
: Main system clock oscillation frequency
0
1
0
1
TCL20
5
0
0
0
0
0
Figure 9-2. Format of Timer Clock Selection Register 2
Setting prohibited
f
f
f
f
X
X
X
X
/2
/2
/2
/2
4
0
Watchdog timer count clock selection
4
6
8
10
(312.5 kHz)
(78.1 kHz)
(19.5 kHz)
(4.88 kHz)
3
0
CHAPTER 9 WATCHDOG TIMER
TCL22 TCL21 TCL20
2
User’s Manual U13952EJ3V1UD
1
0
Address
X
FF42H
= 5.0 MHz.
2
2
2
2
11
13
15
17
/f
/f
/f
/f
X
X
X
X
After reset
(410 s)
(1.64 ms)
(6.55 ms)
(26.2 ms)
00H
Interval time
R/W
R/W