NEC Figure 10-2. Timer Clock Select Register 2 Format, 4. : Don't care

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CHAPTER 10 WATCH TIMER
TCL27
7
TCL26
6
TCL25TCL24
4
0
3210
FF42H
Address
TCL2
Symbol
TCL22TCL21 TCL20
5
00H
After
Reset
R/W
R/W
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
TCL22TCL21 TCL20
f
XX /2
3
f XX /2
4
f XX /2
5
f XX /2
6
f XX /2
7
f XX /2
8
f XX /2
9
f XX /2
11
f X /2
3
(625 kHz)
f
X /2
4
(313 kHz)
f
X /2
5
(156 kHz)
f
X /2
6
(78.1 kHz)
f
X /2
7
(39.1 kHz)
f
X /2
8
(19.5 kHz)
f
X /2
9
(9.8 kHz)
f
X /2
11
(2.4 kHz)
f
X /2
4
(313 kHz)
f
X /2
5
(156 kHz)
f
X /2
6
(78.1 kHz)
f
X /2
7
(39.1 kHz)
f
X /2
8
(19.5 kHz)
f
X /2
9
(9.8 kHz)
f
X /2
10
(4.9 kHz)
f
X /2
12
(1.2 kHz)
Watchdog Timer Count Clock Selection
0
1
TCL24
f
XX /2
7
f XT (32.768 kHz)
f
X /2
7
(39.1 kHz) f X /2
8
(19.5 kHz)
Watchdog Timer Count Clock Selection
0
1
1
1
1
×
0
0
1
1
×
0
1
0
1
TCL27TCL26 TCL25
Buzzer output disable
f
XX /2
9
f XX /2
10
f XX /2
11
Setting prohibited
f
X /2
9
(9.8 kHz)
f
X /2
10
(4.9 kHz)
f
X /2
11
(2.4 kHz)
f
X /2
10
(4.9 kHz)
f
X /2
11
(2.4 kHz)
f
X /2
12
(1.2 kHz)
Buzzer Output Frequency Selection
MCS = 0MCS = 1
MCS = 0MCS = 1
MCS = 1 MCS = 0
Figure 10-2. Timer Clock Select Register 2 Format
Caution When rewriting TCL2 to other data, stop the timer operation beforehand.
Remarks 1. fXX : Main system clock frequency (fX or fX/2)
2. fX: Main system clock oscillation frequency
3. fXT : Subsystem clock oscillation frequency
4. ×: Don't care
5. MCS : Bit 0 of oscillation mode selection register (OSMS)
6. Figures in parentheses apply to operation with fX = 5.0 MHz or fXT = 32.768 kHz.